Development of low friction magnetic recording tap

Cole, P. T.

Kupperian, J. E., Jr.

English

NASA Technical Reports Server

REPLY TO 
ATTN OF: GP 
TO: 
FROM: 
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION 
WASHINGTON. D.C. 20546 
October 15, 1970 
~S~/~cientific & Technical Information Division 
Attention: Miss Winnie M. Morgan 
~~/0ffice of Assistant General 
Counsel for Patef~t Matters 
SUBJECT: Announcement of NASA-Owned 
U.S. Patents in STAR 
7 
In accordance with the procedures contained in the Code GP 
to Code US1 memorandum on this subject, dated June 8, 1970, 
the attached NASA-owned U.S. patent is being forwarded for 
abstracting and announcement in NASA STAR. 
The following information is provided: 
U.S. Patent No. 
Corporate Source : Goddard Space Fliqht Center 
Supplementary 
Corporate Source 
NASA Patent Case No. : XGS-00373 
Gayle Parker 
Enclosure: 
Copy of Patent 
NASA-HQ 
https://ntrs.nasa.gov/search.jsp?R=19710006503 2020-03-17T02:40:44+00:00Z

. . 
- - 
..... rn 
w 
. - 
- - 
= +Qct.4, 1966 P. T. COLE .ET AL 3,276,946 - - - -. 
. . . . .  LOW FRJCTION MAGNETIC RECORDING TAPE . -. , - . , 
=p. -. 
. . 
. ., - Filed April 25, 1961 - 2 SheetsSheet 2 . .  
' . f ,  : . . . . 
. - I . '  . . . .  ,- .. .:.-; ,> -:: ;. . . .- . . - .  , . . - 
. -.?. - -  . 
I .  . - . . , -. . . . . .  
. . . . .  . . . .  
. : .  * . . > , . . . >  
. .' 
. _ .  ' .  - 
- .  . > . .' >. . . 
. . . .  
. . . .  .;; >;, .* - : . ,. . - : . .a .- . 
. . .  
-. 
. . 
. , .  , . -  . - 
. .  . . .  
. .  , . . .  . . .  : . . . . . . . . . .  
. . 
.I.: . -. 
.,- . .  . . 
> .. 
. . 
.. , 
. . . . . .  . . . . .  
. _ _ . _  _ _ .  -  : ' 
. . i .  
. .  . . : . : . . . .  . . . . . . .  . . .  . . ..c :-- . . - .: - 
, . . %  - .  , . 
. .  
. . 
. . 
-.. 
. . . .  . . .  
. , .? 
. . . . .  . . . . . . .  
, . ! .  ; : -
.' _' 
. * .  . :. : r .  - 
- 
. . . . .  . . . / .  , -, . . , .. . - .. * . I -  . - .  . 
. . .  . .  :. . - -  . .. . . .  ". t .  - . , - . 
. . . . . .  
. . <  I.;? 
. . .  
. . 
I . . . . . .  . . .  . . - -  . . : ? .  . . 
. . . .  .......... 
. . 
. , .  ' . _  I .  . 
. . b-. 2 :... . -  . . . < . . .  . -  
. . _ .  _ i .  . . . . - 
. - [ _  _ . ' _  : . .  ... . . . . . . .  . . . . a _ .  .,. ;. ;-. :. ; ' - ,+.#.?? 
. . . . .  . . - . .  . . .  
. . - . .  
- .:__ .., 
. ... . 
., * . 
: .:, 
, ., . . . . . .  . . .  
. . .  
- .  
, / - .  
. . . .  
_ 
..... 
..= 
. 
# a;. 
. . 
. , 
. . . .  :-'. .>.= ,*: .. ; ..*... 
7 = . . ! .  
P - . . . . . .  32 ? . '  .. . : a  ' - . - , - -,. . -: " . -j - . .i-. < - . 
- .. , . - --G.; ' .L-~:: - :  .-.%.'' 
. . 
. . . . .  
. e . . . . .  
.' . 
-, C:: - 
34 L < . - ., 8 F I G , . 3  . .. in 
A - 
. - 
. - 
., . . 
. . . . . .  
. . .  
INVENTORS 
PLEASANT T. COLE 
JAMES E. KUPPERIAN, JR. 
3,276,945 
LOW FRfe'flON Itl.%GhETIQ: RECORDING TAPE 
Pleasant T. Cole. Waslringlon, D.C., and ,Tames E. Kup- 
perian, Jr., East Rkt>rda?e, Md,, aslit'i-rora m rhe Unired 
Slates of Ametlc:+ :I> represented hg the .&d!<tiniararcr 
of the Xationaf Aeron,tuties and S ~ a c e  Adn~izrLstraciun 
Filed 9pr. 25, 1961, Ser. No. 105,518 
1 Claini. (Cl. 161-189) 
The invention deccribeed herein may be manufactured 
and xsed by o r  for the Government of the United Skates 
of Airterica for government~i purposes without the p).- 
mer t of any royd:ies thereon or therefor. 
The present invention relates to magnetic recording 
tape and more particularly to an  improved low fricrion 
magnetic recording tape having characteristics of high 
fidelity and long \$ear. 
Mecl~anical tape and \$ire recorders are enjoying a 
wide use in both commercial and Gomestir, applications. 
The majority of these recorc?:rs u~!lu.e a 191lg lil;rgoeii~ 
tape i~kiish is 3:ortd on a >upply reef n ~ o m t e d  on  a deck 
of the recorder. The rnaynelic rare travels from rhe 
supply ree! past the recording and/or play hack trans- 
~%cc.r and IS wound onto d &be-up reel fcr  s t o r a ~ e  afier 
th- information i3 e~ther  reco:ded or  read frgal the mzg- 
netic tape. Recoiders of :his type ~equ i re  a great 6es1 
of  manual irnaipuldtion for positioning both the suyaly 
and takeup :eels arid in threading the mtgue!;c tapr so 
that  it \vi11 correctly tra!el be:iifeeo these t n o  ree!s. 
The app1ic;tion of m3gneris rccoiders to store dzia 
measured and observed b) cx;xrimental rateil~tes or deep 
space probes is expected to Iccrease niantfold in the r e G  
few ]ears. Bccause of Tile long transmi~cion di>tances 
and t!ie lln~ited power ava:lcbie for iracwiission of this 
dat.4, it is dchirabie to record the dats ss  it oicufi  for 
later tr~nsmis.ion to e'~i11botind :ece~vinc stations. P e  
nature of the \chicle containing the\e recorders not on14 
requires ih,.t the11 oi;rrL*:ron he co!i:pl:tely auroniatic bat 
also places severe !rm:tatrons on their size, weight, re!i- 
ability arid pone1 ccn3uniption. 
Recent decelopii~er~ts in cr~rlridgs loadcd recorders h'>-cre 
peymifted autcmniic or \erni.l~~ii>n,atic oyerztion of ma$- 
netic tape rrcorjzrx fcr Jornc>t,c as \tell as s p x e  a;?p?tca- 
tion. It has been fcc:nd to be ,>dvtlatag:ous to rit:ltze 
orily a single reel in :hes.- cartridges \it>l:h cont:;c\ 
cndless loop of n;:$nzitc : q e .  The m.d_tnetic t c : ~  is 
mounted on the ieel of rile cartridge in Ihe form of a 
- spiral bound coil :in\,rng csncertric cyhndncal con~o lu -  
!iozs. Wit- tape is remo\:d from the innermost convo!u- 
tion of the sp:ra! coil, tr:>:~k p,id the trai:sduce~s oi the 
recorder dnd is returned to ;he otiterinuct ccnvclution of 
the co~ l .  'The t r p c  Ir tPc I wcu*,il rhrougrt tlic su~ceztri\e 
concentric cyiinblcst con'roiut.ons of !he t lpe  i0.1 ~r?! l  
i t  apaizi iiesomcs iht, inncmmos! convo!~iicn on the r~y!. 
E'_tic~lccs !nc,.\ ,if ::jx ni(ii:riiid 'is aio-edescrib~ii o? 3 
s 1.21~ recl haive b t i n  adapted foi 1,ki- in co.i.~eri:io.,.I Zla:i 
5c1e!ity r i .~uti ier ,  i,lr iir,int.iiil ordrjly siorasr and 
snlooth c'l;erat,c,l ::>-reof. 
Tape Fazr?#-i-,-otllr,i. r , ~ a n s  w t l l  "hnoihn in the 311, S C C ~  
a Ar.iei1 c I I i 1 dsif ~ d i ~ r  rulter, is ~ ~ x Y I  to PC,,: 1: 
rnitcrrflos coi~icrlil:>rrn ri: tne i &r-i f ~ 3 r - n  ?ix ice1 =il: f z -5- 
st?ni~sllp dor;%lant 1,ntnr 5 ~ ~ 9 4  Tl; s pu1kng hctioil, on  
"riic i r i i t ~ i n ! ~ ' ~  ~ c ) n \ ~ ~ : u t t o n  bf the l a p .  . L ~ O S ~ S  1J3~1r-g k- 
I seen  *:d;dcent conrcinlion> of rhe tnpe COI! 3s the 
rdxances on  the ;XI. The frxiiitn rruiiuced >kr-erza 
the cidr,lccnt coii.oIu:ion~ of thr t s 3  !li.c> tqpe  corl >re- 
duces a d r a  on the tape whic!~ rotcites the reel s o  t ha t  
the endless tape wlli be fed :o as ucti a\ from i h t  riil. 
Addittonal drive means rn'iy be provided to help rotate 
the reel s h r n  extremely large reels are used. 
Accuracy in  recording fidelity demands that distortion, 
such as "\\ow," or  vari~tions of the s ~ x e d  of the magnetic 
carrier be reduced to a ntininium. One difticully in u-ing 
endless loop lapes xonnted in a spiral form on zi reel has 
5 been that the friction that is norinaIly produced bet7neen 
successise co:~volution; of the endless tape causes uneven 
teosion and hence raiiations in the diaw or drag of the 
tape as it is pulled from the ree!. The uneven tension 
results In variations in the speed of the tape which intro- 
10 duces ;neccuracies and loss cf recording fidelity. 
13erctofore. gtaphite has b-en app!ied to one surface 
of the magnetic taw as a lubricant for the tape io reduce 
the friction betaeen adjacenf con\o?utions arid ;o obtain 
a unifomt drag as the tape is removed from a storage reeL 
15 The graphite has been sprinkied or  coated on :he tape ir. 
the icrm of a thin film deposited by v3rions carrier flui,ls. 
Graphite coatings, honevei, have proven unsatirfactory 
especially for satellite use siqce, regardless of how the 
coating has been bonded to  the tape. the graphite has even- 
t u a l : ~  rlibbed off with use producing isrge increases in 
rile f:icrion of the rape and uneir~ri  tension as the tape is 
drawn from the reel. 'These factors result in increased 
lotiding on the tape irarspo~: ca~ising :peed insi~bility and, 
cocsequently, deterioration of the recording quality. In 
25 addition, it has been found that the accuniulatiun uf the 
graphite rubbed OR from tile tape damages o r  at  least 
coa!s the rec,~rding and/or plcy bacl  transducers of the 
rccordzr lo furtlier diminish !he recording quality. These 
problenx are extremely sei-iocs iq spsce data recording, as 
30 the innccess;b~iity of t l ~ e  recording mechonivn for main- 
tenance 9,iicn the fr1c:ion hss bziorne sufliciently h ~ g h  
cau5es the recorder :o jam, stn:.p;n; its opzration. 
?he  gmeral purpoce of the pleceilt invention is to pro- 
v!de an implo\?etl ni:i,:i:eiic tap: coortruction uhich em- 
35 braces a:] the ad\rnntages of s i ~ i i d r l y  en~ployeil magnetic 
tapes and powsses none of the rfnreJescr~hed disadvan- 
t.;ges. T o  obtain this, the i11isst1ot7 co~ ie inp la~es  utiliz- 
ing the st~perior dry lubricntlng chsrdcierislic5 c i a  fluoro- 
carbun pl,istic as an anttfriciian agent to pro\ ide a non- 
40 dete6~r;lting Ibbricant for high firleiitj~ recording taws. 
An al?)tct u i  the pcsent i:!ventiori is to provide a mag- 
n t t ~ c  !.IF uh ic !~  oper~tes  eficie~ltly nithout maintenance 
over l0r.g periods of  t i n e  xritil a miisinturn amount of 
~ i ' i f . : ~ ~  friction ilqd ~ ~ t h o t l t  the rtsuliitl:: deteriaration 
45 of recorrlinp fidelity. * 
A fc:rttltr object of the inbention is !o g-rovide an  
iniprcled loiv friction mqgretic recordrng t a p  especially 
suitabe as an endles- mag:.,~etic tape for use .with single 
reel recording devices. 
50 A ~ o t h e i  obrect of the instant invention is the provi- 
sion of an  irnprcx,~\1 m?gnevic recording tape, the pro- 
longed rtie sf %;hich will not damage the trr*nsducrr ele- 
ments of a faye ~t -order .  
i\;r~:hc'i. objiaci of this in~ent ion is "r provide an im- 
sfi proxed extren-irly ~-;i.ibfe rnrigqetic recording r a m r  
&\~ci*n11~ '  sd~iable for  spp:icatrons where maintensncz 
IS irnpr3cii~d'~k, such as. fur ewrnpfe in $pace r x s r i -  
ine:,ls. 
Other objecrs 'ind ~d:,,niages or' tile inve~rtica i r i i t  
-Z bl'i)~~.ifier becorns r7>nie fcl:v zrp lrrc: f:i:m r\c fc.1- 
?cui,,g iEi,crrpZii*q of :he *:,inraed ?ris8 I n p ,  uhic3 dius- 
:rat- A n,cFerred ernSodiment, .lnd %herein- 
FIG. i 1s a dtagran~~natrc plan v2ew of a i ~ ~ i c a l  loop 
t\;\e recorder devjce :o whrch : l ie invrnrion i s  parircufar- 
G5 iy  ada$ahle; 
FIG. 2 represents a :ri;zs .,ccisirnni view of one en.. 
bodinlent of the instant invention; 
EiG. 3 i\ a broken away ~ r s p c t i ~ e  vi w of a mag- 
netic tape reel iilitrtrathg the reduced friction t;%tain- 
able f r ~ n i  practicing of the i*stani &vention; and 
3,276,948 
3 4 
FIG .i is  a di.t:rrrrnmatic vieiv in eli-vatinn illt.stvsf;ng m e ~ t  is a p p k d .  1 he 3 S. P'iteiti Ncs. 2.809,120, isstwd 
one shitabli procsss for bonding ihe lt~hrjcanl maieiiaI on October 8, 1957, tc. G. Rzppaport; 2,P23.026, issued 
to the ~ n z g n e ~ i c  recording carrier. ou February 8, 19.58, to H. N. Homc;er e: al; and 
Refcrr~ng now to  FIG. ;. the recording device gen- 2345,773, issued on July 9, 1960, to A. Pacagroqsi et  a]., 
erally inckated at  Iff hns mouu!ed on the upper deck ; disclo3e processes and adhesives for bellding fluorine 
thereof recording and/or playback transducer 12 en- containing synthetic resins \\.herein the surktce of the 
gaging an endiess ri~agnetic recording tape 14. Tke tape resin is ;rented &fore -:he bonding adhesive is applied. 
14 is a i r a n z ~ d  to f o l k  convolutions upon itself within The process and adhesives dIsclo5ed in t1:ese pntents may 
reel 16 as will be further described hereinafter. ,4 suit- he sdapted to f o r n  the bond hetween tbe polyeihylene 
able motor (not shown) drjves capstan I8 \.ihich with 10 tcrephthaiitte arrd the polytetrduorcethylene in the lam- 
idler roller 22 moves the magnetic lays past the trans- inate of FIG. 2. 
du;er 12 LO that informational items can be recorded A variety of other processes and adheshes are also 
on ;he magoclic tape or read out i!rerefrom in a con- available which may be used to form the bond between 
~en t iona l  fzshion. Data may be stored on the tape and t'le TeAon and 3fylzr cf the unproved n~agnetic tape dis- 
when desirsd, as for exan~ple, on receipt of a command 15 closed herein. Some of thebe adhesives are more readily 
signal, h e  trznsducer 12 is activated lo extract lhe re- adapted in the bonding precess ior  rnak~tlg the laminate 
* corded information from the rnagne;ic tape. A pres- of the preferred embodiment of the instant invention as 
sure pad 2.0 is provided to pozition the magltetic tape they do not r e q ~ i r e  pretreatment of the +urfacc of &e 
relative to the transd~rcer head 12. The single trans- . polytetrafluorothyft-ne f i ! ~ .  One such suitable adhesive 
ducer 12  may be used to eithcr record or play hack 20 is a nlodified polyester xernent with cross linking agents, 
recorded informat io~~ as is well known in the art, o r  such as Du Pont Cement No, 16960. 
additional trznsducers nlay be provided, snch as, separate In FIG. 3 the spiral convclutions of the improved iape 
recold 2nd reaid out heads ~ n d  an erase head. 32 can be seen arr.?nsed on reel 35 with one portion of 
:n operation, the driven cnpstant 18 and idler roller ihe tape leading away from the innermost convolution 
ZZ frictiooaliy engaze !he l a ~ z  14 to pull the innermost 25 towacd the trnnsrlucer and 'inother portion returning from 
con\olutio;t of rhe tap,  fmru reef 16 pa% the ~ecording/ the transducer to become the otrtsrrriost convolulion. It 
pla>back :i-znsducer 12. Tile drag or draw of the tape will be noted thar each convolution 34 of. the endless tape. 
cauqes rcel 16 to rotate and to rewind the tape in a s2iral I U ~ S  against the two adjacent convoirt!iom i-i proceeding 
fashion back on the reel. The t a p  is continuously pulled d o n g  its route through ths reel 36. 
from the ro:3!ing reel in ?his mar re r  and advances 30 BY means of the ficc-ozaibon Tiastic o r  Teflon back- 
through the s:>c<essive convolutions of +.he coil unril it k g  30 of-the nonrnagne-JC surl,~ce of the tape ribbon 24, 
again becomes ihe innermost convolution on :he reel. a pernlanent, c~n:ini:ous, ncndeleric~r,iiing lubricaiina 
fn  FiG. 2 there is r!tnstra*ec! tin ernhodirnent of the surface is p m \ r d d  which sufticier!Iy 1uhrica:es the ad- 
present invent~on which cor~s~rfs  of a Ae;ible nonnlag- jaccnt convolutini~s o: the t ~ p e  to jerrnit a iuw uniform 
netic bnse or ribbon 23 which has attached to one sur- 35 drag as the tape is :cmov.eci fro111 and uwund onto the 
face thereef ; m,i_cnetic materizl 25,  such as iron oxide reel. Thus, the s[>ced irregular it:^ so detrimental to high 
particles or tbz like. The magnetic particles may be fidelity recojding 1s clilniilaied. In iiJti;!:on, as the Teflon 
bonded or  sdherently a:tached by a z  :idhesive '25 to one bxk ing  k permanently boqded to t k  tdpe rihbon 24, as 
side of i5e r-i>t.cn 24 ig ,in) $ui:sbie nlnnnef 3$, f*,r ex- by adhesive or  other st:;!abic means, no accun>nlation of 
ample, dcscrlbd in 3 S. P.ir~iit S o .  2,607,710, jssued on haniii:ll deposits of this ':lbri::tinc elenient TII]] contami- 
August 19. 7,552. The ribbon may ccnri\t o i  cell 11osz n " ~  the tiaiisdueers of tbe rc-oriirr n~schsnisms. The 
nitrate, ceiiii;ose ace:zte, ie l lu icx  bu:yrate, polyvin:;] end lesillt is a Zi~h--r  q~.ii:tj,  recodin: for mnch greater 
chloride o r  ihe tihe. Ori the opposi?e surface of the rib- l e n i ? ~ ! ~  of  time, th:~n is p o ~ i b i e  u r:h conveationally lubri- 
bo:: there is handed by an adhc~ive 28, o r  other\v;se suit- c"!~d mapnetlc, recordillg t aps . ,  
ably a?ta;Ii:.J, an inert p!?stic vario~lcly knoivn as f l ~ o r o -  45 One s~treable process far tinding R Tefjon film to the 
thenes. t i~ ra roza rbo~ ;~  artd iidoiochen?ical ~!actics .in the n1a8!etic carrier T$fyiar ribbon ic dzpictcd in FIG. 4. A 
form of a f i l ; ~  30 :o provide a  continuo!:^ uniform lubri- sheet or  strip 60 of  XfyIar haring n uniform viidtll and 
cant b a c k i o ~  for the ribbbn. thicl ness i~ d!;iun from a supply xoll 38. A sinrage con- 
For high fidelity ap?!icztion, such 2s required by space tainer 42 su~p l i r s  211 adfir-ive 83, 5i1ch as the aforemen- 
experime:l!s. the rIhhon 2-3 of the cnrh~dintent 29 tioned L7u Pant C e n w t  yo. 4960 ,  in a Ionr viscosity liq- 
compri%s a stlip of pai>elh>le;.e phtb21atc, sola uid zal"; lo to ikr  41. The aclhesi\e 43 is rolled onto the 
~ l n d e r  the ir3deZi3arX &i:,fsr, \ i h ~ c h  is oriented by stretch- r i g ~ ~ n  40 and is drrrd as ii moves plot a heat lamp 44. 
ing in t -0 schstnnti.>ily ~ r p e p d i c ~ l a ~  c!ircc[Ions and A supply 46 ~ro\ i l ies  a strip o r  film of Tefion 47, 
-.~,+-i;: sufi3cien~]y iligh to &;w a chalacter- haking a unlfoml thi~kges5 and of a?pruu;mately the 
istic crystal diifm<:ion partern >\hen stretchei]. 55 Same Width as !he hf!!~: Srrp 40, to tile adhebivefy coated 
~b~ ~~l~~ r;voon or be, for  example, one ~" i i az2  of the l l i ~ i a r  s:.,p 40. The Teflon i i l n~  47 is 
quarter of 2n jGch %ide and 0.j mi] ;hick with magnetic applied in an aligned i:;anr:er ovtr  the aG~esive layer a ~ d  
coating of ;,r, ;;an aoxide compopnd 0.5 mil :hick adher- is f'rmly %cured to thls ~ u r i a c ~ ,  rjf !>a > ~ j ! z i  strip by 
enr jy  bonded to orie side of ise ~ f ~ l ~ ~  1 -  Pr""ure rollers 48 to f m r ~  r; I . ~ h ~ z , i n t  ~o3 t i z -1~  for a 
film ti?rilprtsss a 1.0 rI>;l filill of poi~,eterra~t13ro- 00 ~""ac" of the Xfy!ar scrip. The ?Iqjar-Tr+Iun I:ln?:nste 
ethylene pre <nil;. sold i tnjer rhz tradernark TeBon. 49 is then stcied by 111;. s ~ p r i y  ro!I 50. Sur:?b!e drive 
s ~ ~ ~ ~ ~ x ~ :  th,cker or ib,anei *lc;on luhric:in"idinls nlay meal" anre' prub~il2d :o:.A'ng CJ\!I of thz ro~lers and 
, w ~ ~ , ~ ~ ~ ~ ,  2llz 1 3 xnrl &iticiness " C P D ; ~  mllf as r~qulrcidi. li\~r3d 01 5tor11if: tnc fnnllnare 
prcw~tie sat*sic;;tiir:. rc\r;iti 49 d S  ~ ~ O V ~ J I  3.1 FIG. 4 ti-, i r o i e \ \  xnaj znL:j& all the 
,rie pro5css ban,irli: ceiifr;5 syr-i:hiiic ~j "f"i3' pcCCSCarY ,?dhi ip  iJLs ?n?:p,eiic in, :,ng :u the In the rAq:, *' 
resin? habarg a high Auorine conieni, sii~i2 ds pohtetra- M5li.r sorlnce oi ti-e i,ln;lnsie 44 b r f o ~ e  thc 'aminafe is 
fiuorenhqlzi.e {Tenon), to itself or :o other maier*a!s f idq "t""'3- A W  5ne oi a ~wnl>-:r of ~ ~ 1 1  6notr.n proceses 
rr;anv plobicms. '13~s- ,robfems since a ~ ~ b l n g  a 'WYie t iC  c-cl ng to !he surfXe 0f a mag- 
*he aforenieprlcneri rc\jnq 2 rei,:lvt.iy jaw coefii- netic Laiicr ribbon mci, he ::\ti! :hre.n % ppruvide the 
cient of Er-ct.;2q. ht#:ll rbermal stabii:rg ,-;:d high r~.-;~t;ilcc ';O P: i g r l~ tk  CC!Z!!ng for  t k  JIyiar surfaL= of the lami- 
to wetting 5 y  w2a!cr, cemen!s, adhes~ve and ilolvents. nate 49- 
Psoceses dr?d cerncnti %,lye been devrlop~it to ;idhere a ?rirce~ses, other than t3e ~loredeccr,bed, inay be 11ti- 
filnl of- f lusene conraining 3:rrtbetic resin to itqeif or  ?izci; to ct)rtstn~cl the Idnlinaie of i-!6. 2: S:r,:l processes 
to  other nrz!erra?s uhich include treatment of  the sur- may be of the type uhcreir? a fitiorine soniaining syn- 
face of the= s~n the t r c  resina beioie the adhcsive o r  ce- 75 thetic lesin which has rhe crassdry  lubricatrn; poperiles 
* 
- 



Low friction magnetic recording tape Patent

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server