.. I 

I -

REF ID:A104786~ 

WDGSS-83 23 October 1945 

SUBJECT: Declassification Patent Application Serial No. 443,320 

TO: Chief, Security Division 

(noted but not necessarily approved-MGJ) 

1. The attached paper considers the problem of declassification of Patent Application Serial No. 443,320. 

2. Recommendation is made that the patent application not 

be declassified. 

3. Informal discussion with Commander Weeks, OP-20-K, 

who discussed the problem with Captain Smith, OP-20-Y, indicated 

concurrence with the recommendation. 

4. It should be observed that, conprary to the statement 

of Mr. Friedman's letter, only in part are the principles of 

the patent application utilized in the Converter M-294. There 

are rotors involved in producing a keying sequence in the Converter M-294 but the manner of combining the key and plain- . - text signals in this device is not the same as in the Converter 

M-228, described in subject application. 

2 Incls 

1. Ltr 27 Sep 45 

2. Study· 

/s/ L. M. Myers Lt. Col., Signal Corps 

Chief, Communications 

Security Branch 

Declassified and approved for release by NSA on 09-13-2013 pursuantto E .0. 1352a 
,. 

REF ID:A1047'&6 

' ~1 ; • ~ u t~: ~ : : . . . . . 

27 September 1945 

SUBJBCT: Release ot Patent Application Serial lo. 443,320 

TO: Commanding General 

Army Securit7 Agenc7 

1. The subject patent application covers a crJPtographic means and device tor automatic eneipherment and 

decipherment of telet7Pevriter signals and vaa tiled in 

the u. s. Patent Ottiee on 16 Jla7 1942 in the name of the 

undersigned and Prank B. Kovlett, as co-inventors. 

2. The principles involved 1n the subject application have been utilized 1n Converter •-228 and Converter •-294. 

3. It ia requested that the subject application be 

orr1c1all7 declaaaitied in order that it ms.7 be alloved to go 

to 1aaue, Whereupon the right and title Yill revert to the 

undersigned and Prank B. Rowlett, subject to an irrevocable, 

non-excluaive, and roJ<7-tree right and license remaining vested 1n the United States of Aaerica. 

4. Thia action 1• desired becauae of the commercial 

applications Ot the invention, interest in Yhich is believed 

to exist on the part of the u. 8. communication compan1ea. 

5. Declasa1t1cat1on of the pa.tent application does not 

neceasaril7 involve the declaaa1t1cat1on or the specific embodillenta thereor represented 1n the apparatuses .. ntioned 

in paragraph 2. 

WTI.LUll P. JPRDDJUJi 

,..-"\ I , -r"'-... L_t '~' -L«' .... c. ~ '· 1 

@ONFIDENTIAU 
REF ID:A104786 

Sti:ORE I. 

Pll.OBU'..ll PlWlElf'.fEDt 

l• 8bo.il4 d..clMd.tioation ~ Patent A;lplS.Mtion l•ri&l Ko. ••~.. Ro 

U. t\Uthocl•~• 

F AC ts BE!R nm oo !He CJ.St t 

•• !M dnio& il!t d-.cri'bed in '\liit ,at«n~ appliQA.tlon i• dJ:tilar w 

~ Convortf.tJ" lf ... 226 rot incor)Jtira't-$1 two tnturo• not proeent. in the 

Con~r ~fl. In a.drtitS.M1 th• ~plioktion doae not atate •pocifioo.lly 

tht type ot eontrol to 1- «iipleyed 1n tho ll);O()hlmi• of th• 11tibjoot p!!ltent 

~ Adw.naine; t.he rote,t1ng ewi~hf.m (~tora ). 

•• ~d.on it 11119.d• tor ~g 'th• rimibor o!' hput; :po1 nt1 to 

b• einwgiffd,. ind the n.ttt\bst" •Yb" aocomplbhGd by tho op&ra.tor at my 

•Peoified tbwl. 

b. Th• fiw output l8da •Y bo permuted. in •r.w 4t 110 wt.yiJ,. 

•1-o at *1• will. t)t° 1lh• •Pfft\tor. 

·~ ~ -.ppl.ia•tion •te.~t'l tha'b at~pin$ W adv.xi.(Hltllii$ub Of the 

Ntating aldtohl!lrB oa.:n ~ ~~ in a ~l" eJ! ·~~ either }'>..-iodio er 

t.pm"iodio, and that the JSllmlM' or do1nt thh •re well knCMn in tho art. 

1.. Althonth th• epeo1r1fl •PP11Mt!on or the prlnoiplft 1'tated in 

'tho patent ~:rlioatj,on 1' not •booied in the C<irrnrwr ...us. it ap~ 

that the 'Ohm ot the i.n'VIH>.tou inolu~t:'I the •P&eif'io ce.so o!' th• CC11'1Ve:rtar 

)ll....tt8t ldth tho •xcu•~tif)l'). tJr th~ at&ppinf,'; tton'troL. 

'· ~ p8no:o& in th$ Ansr,;r •nd :h"Y ue .f'N!ll:tar '1dth th# prlnoiple$ 

d.Horib&d in 1itte aubj~t •ppliot.tion,, -.. ~luy-4 1n the Ccnvartor M-f2B, 

&Ild QiQUld ¢;&pl1.0&te abdlaJ" ~nilll'!G l:MJolllUfO of JU.ah mowltdJ:V• !her• ia 

now in coaQ411• howeT~. a. bill 1dlioh, it .PU•«i.- wuld pl1tea a definite 
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tJGl.trol. oti l"Ol.. • ot Uf" intozw.tim of' • •yptop-aph1o ~ oryptan-.11t1• 

oattl.-. ge.1ned. wh11.• ~loy-4 by~. u. a. ~traont w tu ttt• An.Y or-

•v.1• 

•• fbt Cooftrta- ~28-. been~ •ftila'bl.• tb "11• '.lriti1h 

~ntu:&l:\ •<> tho.t a.t th• pNtat>Ut tiDe tbit SJri.no.iplu a& .. not the ... 

o1uai"" knowllKl,t• d thl u,... 1 .. llowf'r.ilHlnt .. 

8.- W.C. ~ enc1phtrring tol~ tipla haw ~ nl1 known tor 

#nitl'lll 7•an • l\1Pply1nt; • io.tylng • equ«nofil tor «L01phonumt •1 la u... 

co::iplbltod by 81.tb._. ot- tw ~~' 

-.. ..l. prntoualy Pl"1J>a.t"Od b)' t.,r u.• in the d'1v1o•• •uoh .. 

,.l"toratad tap• ·<»" 1iaPN• 

b. A ~h•uioa.l ~ l,)t prolucing by whi.oh ey 0.. oonnectad 

to a. tdet";p• and uaed ... :required. 

~he .tint JlfAf.od ~ b·1'"1 known tor •4'V~al ;yara aJJ4 a.. Pl\.1.la.bl.• in • 

o~c1•lly ~taoture4 ucyptop-&l'hia ~~· (f•lmypt.Qn). th• .... ma 

iil.Otl:od 1- »0t kna¥tn i» ha vi bocm ut.t.U.aod ur:. t1l the tntbjffb patent ~pl.1..,_ 

tion d.•Qr1W ca.e -way t,;l utl.lisi~ • :MohaniAn!l •ttaohed 'te .. tol.ty~ • 

.M iOO:i.oa.ted ln the pate$ Qpll•t.ton. th• •i:tlwnS.• e.plo)'a rotating 

switoho1 (roton) 1lo produoo a J.oni m:n-..repea.t1ng ny. ~~·tu"• 

knaim to haw \Mlt.<l • llltO~..uiieal •-.n. ot produ.c1ng • byi~ a•quetlekl tcr 

·tnO!phorl.ng ttl.typo •l.r;nat. 'bu1; based upon • 41tt•l"4mt prlnotpl•. th•· 

¢nolp1e •fi4 by h Oo~ b .alo~ 'be th• utlon at tho b)' 

-.h.Hl• in th• Cwverier -...t09. 

"• !he c11ypt6~rih10 •yattcw. u«t bi' the tr!!' a. aov.n.n\ reproatnt 

tbs 'high.ft\ 1.,..11.n • "llVl"ld with "9pectil to •lllOtlritf .we!. praot1.,•'hil1ty 

ct' optmtttCCt. ltith l'tJFd to ~ •ourlty ot arattm1t .. ttenti\"Al l# 4l.t'wJOt94 

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to }ltmiQrandum tor Co1®•l Cord!;)toe.n• dated lS u..r.:,'h l.9-48., •u'b.1•ot • 8ecllri 11;f· Of 0~¢' higti ... ~o Or;tt'tb;,;rtphio tr'JI~• ~ O«l.QlU81m1 •t:l..tocf 

'tb<irdn l• *!Jw;y (Gez'Mnl d Japm:t••) ~ ...-i and.,._. not road!n& 

our high ... GI"ad• ciph$r ~.i'io. • 

a. DtlolaJtr:ifim:.ti't"ll ot tht 11'.ltrthod,. th1'l"Gb7 Nir1ll(; it aya.1lr.bl'9 to 

tey"OJ'l$ lf'ho •Ur'!in" tha patct_. o:r •lumld o~m•l Mdel• 'beooe:w a'Vl.11· 

a.bl•, mkin' 11' pottd'bl• to ~· thutS•1 'fd¥ nu 1Jlt in re.ialnt tho ~ 

grapM.o lovul tttt ot'het ni.tlona. rt.\. the oth_. ha.nd pci.n•• cletlctt~ {the 

ecrner-01 .. 1 EniW<•) -. avd.1•hl& betor• th• W'Al4 to anyoo• wiah1nt; to~ 

th• pul*Ohaae. 

CM .. ot 1 !!It, thnt the requ.Qst of ii. tar-o1g;n i;o-vtJ:miAMlt~ deix1r0ll& or obtain ..... 

in,c ausi•tana. fro~ 'th• Wu Dopa~ont 1n Mt.blith1nr; • *Y#t4*t'l "t ••<ruite 

oodtr.:l ~ 4;)$.phon,. 'b~ unt..vo.rnbq ~!dared. 

l.O~ 8hoold t1ocl.ruu11.N.on.ti"'n of ist.tbjoo'b po-.tont r.&pplioation be avthor1M4. 

._ ~ent will ~ •·t«:oliahoct ngarJ!n,: dtr1tJl-.sslN.ontion ~ hith-0"0-~ 

oeyptot;z'a,phi<J •Y*iAlr4 ~ 

PllWU5Sl'.01f t 

ll. !ht iwo :teatuNa or thtt pa.tent appl~o.tion dittning t'l"<:.Cl t.ht> 

CCl'.n'l!lt"ter Y...1218 app(ta.r to- a.trom gi+ao.tw &eGtJ.tity again9t unnuthor1a4N1 

no.d1"g ot MB••ges. It tho An:ry and kV)" ad.opt thet• ten.tu~• tol4' ineorporta.tio.n in the C~ .. ;r"t;Ot"' Jl-210 tnd the pat~n1t •P~11oation ia d.4'0lu-

•J.t!.it4 all •letenta or tlM pat..nt WtlUld -. ~ent in 1h• Cetiwl*tctr MIS, 

••o-pt. th• -.nn•r ot atep,rlilt ill• rcJtor.. 

11. )Warf# of inpart.tnr • pdi'!odio ~ a;modio- aotion to the rotor• 

~ net •peoi!'i•& mt the applioation •tn.tn that •thcda aonaidtted • 

n.11 kn-.n 1n tlw at"t WAf l>• uted. It -.ou1d ti. JW)l•ib1e to ut:t:U.•• th• 

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~or the CGDV~rt.- l!-134-C to ~.!uee • *l».-1ocU.o 1n0tlon 1n ttw 

~rs.- °""the JtGtt1o4 preaerxtiy cpl.oyQd s.n ._Con~ M-flS,. or 'VN"1a- · 

"1.ona of theea •tbods• Such .-thcdtt,, it nl.1 ta.om,. have nott been ,..94 

to tbo beat ~1" b;y otfl,Jt" •t!Cl'lll• 1t at o.11. 

11. If v. bill now bei'Ol"o c~a l• puse4 aii4 beomte l•• J'OVel· 

at1Cll ot iile ne.turo ·ot ttl9 Convorto.r h-229 w prh!.ed.ploe •Seilr>J" 1n mtu.J-e 

to 1tle CGw'"~ ti-!~ llliy bO probibl~,. 

14 .. Altb~ tbc-e ~ ~la.'b1e tRil w NT¥ 1ntc""8to4 pEU"t1ee etrtain 

~ld.o dtWie~ wbio.'i o1:'fw a. hleh ~- ot aeo~lty. nc» priM1p1* 

1tt11d &lched c!onir:;m 'lDloubtD<tty will t6.M to ·ftliee the or:r~toc"·aphto 

1.wl ot othw na.titUltl u~' th!# C'®ld. !rpo-1* 11aterifllly Pl'O:Na« 1n fllltS.iU.nc tho .:-N1on ot llltelli~ D1'1Uic:a ot the Jr;;;r a'°~~:rit;y Apll.OJ"• 

CCliCUiSiiJtlJ I 

18111 Jttona 41ro l!ainc efide to '*'°teot th• •tra::!~ ••e:11t,i• ar.4 "knolir 

;.o.,• of U• 8. Cl"'.l}.f'...Oct~i.'hiD 8)11,ttlw• Decla1aifiootion ~ a\Uljeot. )It.teat 

&J;>pllfl':.t1on woul~ be ~~csd ti!:> thl.# pclioy. !h•ro 1.1 little rndenoe 

.-11a1>1* • •haw that ot.h..- nat.ittle N"e ao ad:wanood ln ceyptot,:ra.""M. o 

•ttorai. COIJ.8.equentl)"• .f''11"4i>1 at kiol'l~ t;"in®. by •trwta ot U,. •• 

:fltl'8~..nel would be or ~et1t '° ott~ nn.tt(Jl"tJh 

le. other 01"'.i;;t.oo"a.1hio •Y•~ «:Qlll;;«i 'b;y tb.4 u. I. Go~ Mlltf 

-. ee!:'t:':.$JJl'Olal at-?U.et!!.tt~ Md 41&ol."1!~1tioe.U0n ot mt'b,36ttt •i'Pliet..tion 

W\'I01d •t.'blhh 6 procedcnt ditti(Qlt to ow.rCct:iO lt tlml":r Hq'lle8tu UQ 

~ z ,.tonw ot othor •JT~~}hio trf$tonl. 

llSC""~P ·Tle9• 

lfw bit no eiotion be trt:-en toe deolMdty t~ Applioatirm ler1al 

s&eRET 

---·-- -----~-~ - . -·. ··"··-·--·---~ 
( ) Approval & Return (JSAs R ested 

( ) urrence or Comment 

( ormation & Forwarding 

( ) Information & Return 

CSGAS 96 (Rev. 14) 15 Apr 49 8-411 

( ) Information & File 

( ) Recommendation 

( ) Signature if Approved 

( ) Your Action CbY:----. 

( ) For recommended reply 
_,,. REF ID :A104786 

~ ~ a,c.t:-.._ ~· "/--

~ 1 fr--r ~~ 

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