THRU: AS-80 

AS-90 .AS-71 

.. · 

.. BJHllPllJIJt.1_3 tt s -

¥1119'••• ·----·- ...... -

. Auplications for Patent - SN 478,193 and 

SN 478, 868 

1. Inclosures 1 and 2 are forwarded for evaluation and return. 

2. The applications are currently classified confidenctial. The 

question is whether the inventions may be declass.ified so that ·patents 

can issue and be exploited commercially. 

3. Both disclosures relate to facsimile privacy apparatus. 

a. Serial Number 478,193 involves the derivation of an on-off 

signal from a black and white message {picture) and another on-off 

signal from a dummy picture. The du'lll'.!ly message m~y or may not be intelligible in itself. The two signals are added b~ a system of relays 

so that, when message and dummy signals are alike lboth 11 ons" or both , "offs"), an off signal is transmitted while two unlike currents result 

in the transmission of an. on signal. This is, in other words, according 

tothe so-called Vernam rule. At a receiving s.tation, the dummy message 

or key is subtracted. · 

b. Serial Number 478, 868 describes 'a 'system essentially like 

the above except that addition is accomplished by tubes instead of 

relays. 

4. Further information about the subject applications may be 

obtained if necessar~, from Chief, AS-72. 

2 'rncls 

1. Pat Appn SN 478,193 

2. Pat Appn SN 478,868 

S. KULLBACK, Chief 

Research Laboratories Division 

Ext. 284 

Al-«> 9 Jlq 47 the 8ecur1t,,. Division Jaas • ol»Jec1iioil to the 

Ceolaaait1oa:t1on ui releaee of these patent applic-!ltioU• 

2 lilola 

11/o 

A.. SillDJ 

Chief, Secu:riff' 11v.ts1o21 

J!tM•1en ?:41 

GONFIDENTIAL 

-

1 

Declassified and approved for release by NSA on 07-29-2014 pursuantto E.O. 13526----
REF ID:A363475 

GONFiDENTIAL 

'J.'BIU• '8-80 

AS-90 AB-71 6 lfa7 47 .lpp11caticaa t'or Patent - SJf 4"18,193 and SB 478.866 

1. IncJ.oam:tea 1 a!ICl 2 8!'e f'o.nBrded ~or ewlm.Ucm and retuztl. 

2. The applicaticrJs are cur.ren~ ola:Hd.f!ed oontidential. 1'be queaUon ia 

whether the ~ 11q be decluaWed 110 tbat patents can i8sue and be 

ezploitecl ocmercSal:b". 

3. Both c!1acl.osmu relate to .tacsi•'le JE'V807 apparatus. 

a. SeriaJ. Jbnber 4'18,193 imol'ha the derivation of an cri.-ott- signal 

troll a black am white meaaage (picture) and another on-ott signal t1'0m a ~ 

picture. The d\D!V meaaage 1l!l!q or ma,y not be intelllgihle in itself". The two 

signals are added~ a Bfll'tem of relays so that, 1'lhen. mesBaga am d'ml11q s!gn&la 

are alike (both •cms11 or both notte"), an ot£ ~ ia t!'awmd.tted while tao 

unlike cU1"1'ents result m the transmission. or an on sigDa.l. This a. in other 

words, acoord1rlg to the so-called Vernam rule. At a receiv.ing station, the dUfllm1' 

message or k&7 ia subtracted. 

b. Serial Number 478,86S describes a system essentiall1' llke the above 

except th.a~ additian is accomplished by tubes instead o~ relays. 

4. Further intormation about the subjecii applicaticns 'Z:J.'1' be obtained, if" 

rl.ecessaJ.7. f);-om Chie.t. AB-72. . 

2 Inola 

l. Pat Appi SB 4781193 

G• Pat Ap;n SH 478.8§.8 

;1!1P 

s. Ki.JLIA\CJ, .. c~ 

Re:se8rch Laboratories Div181on 

;sxt. ?&. 

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