REF ID:AlOSO. 

OCSig0-334. 7-Sig.C .Patent :Boe.rd (9/1/36) 4th Memo. Ind. 

War Department, OOSigO, Washington. Ja;rrup.ry 7, 1937. To: Captain 

R. G. Miller and Mr. W. F. Friedman. 

10. 

1. As requested in paragraph two of foregoing first memorandum 

ind.orsement, the Signal Corps Patent Board reconsidered its previous 

action in this case but found that developments were insufficient to 

warrant a:r:lY" change in the findings and recommend.ati()ns s.s shown in proceedings of Signal Corps Patent :Soard Meeting No. 6 dated Aue;ust 2B, 1936. 

Inolosii,.e: N/c. 

~/£,~ Louis B. Bender, 

Lieut. Colonel, Si~nal Corps. 

@'pp roved for Release by NSA on 09-11-2013 pursuantto E .0. 1352a 
,,.--· 

I 

I 

~ 

r--

- ----. --· - ----- . ---·- ···-·. -----.. 

REF ID: Al 05055 1i.l.,0 . 

...... - OOSig0-334.7-Sig.C. Patent Board (9/1/36) 2nd Memo. Ind. 

War Department, OOSigO, Washington. December 21, 1936. To: Director, 

Signal Corps Laboratories, Fort Monmouth, R.J. • 

10. 

l. In view of the statements made in preceding indorsement, information is desired as to ~hether your Laboratories have any further comments 

or recommendations to add to those contained in your first indorsement, 

dated June 5, 1936, file FM(SCL) 070(5-27-36). 

By order of the Chief Sign.al Officer: 

Inclosure: N/c. 

FT~ ( SCL) 070 

OCSig0-334.7-Sig.C. (9-1-36} 

~~ Louis B. Bender, 

Lieut. Colonel, Signal Corps. 

3rd Memo. Ind. DEW:N 

SIGNAL COBPS LABORA:roRIES, FORT MONMOUTH, OCEANPORT, N.J. December 2S, 1936. 

TO: Chief Signal Officer, War Department, Washington, D.C. 

1. Remarks referred to in 1st Indorsement dated June 5, 1936, file 

FM(SCL) 070(5-27-36), are still considered pertinent. 

2. The subject was not discussed officially and the casual conversation 

referred to in the lat Memo. Indorsement dated December 17, 1936, addressed 

to the Officer in Charge, Research and Development.Division, office of the 

Chief Signal Officer, cl.oes not V1arrant changing the comments referred to in the 

1st Indorsement dated June 5, 1936, file FM(SCL) 070(5-27-36). 

b V1M. R. 

Lt. Col., Signal Corps 

Director 

Incl. n/c • 

I 

j 

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' 

IN REPLY 

REFER TO 

REF ·- ----·---------------~ ,..,,~i·, ID:A105055 

! 

WAR DEPARTMENT 

OCSig0-554.7-Sig.C. OFFICE OF THE CHIEF SIGNAL OFFICER 

WASHINGTON 

10 

Patent Board. 

September 1, 1936. 

MEMORA.'1DUM FOR: Captain H. G. Miller./. 

Mr. w. F. Friedman 

1. The attached invention is considered to be of insufficient 

militll.ry value to warrant prosecu;tion of patent by the War Department. 

This office has no objection, however, to your applying for patent on 

this inve..~tion provided such application is prosecuted wit..~out expense 

to the War Department. 

~fl.~ Louis B. Bender, 

Attached: Invention 5-12-56 Lieut. Col., Signal Corps. 

lnt Memo Ind. 

Washington, D. C.J December 17, 1936 - To: O.I.C., Research and 

Development 'Division, OCSigO. 

1. Upon the occasion of the recGnt visit by the undersigned 

to the Siglll11 Corps L~boratorieo, this m~ttor wcs discussed with 

laboratories personnel, vlith the result that the proposed systc.n 

appear::: more feasible than was formerly thought by them. n. was 

also broucht out that it is possible th~t t.he .3ystcm might hnve 

distinct military applications, especially in view of ·~he increase 

in use 0£ radiotelephony. 

2. For the foregoing reason, it is requested thut thi3 case 

be resubmitted to the Sig11!:'.l Corps Patents Board £or reconsideration 

of previous action. 

tttached (no ch&nge) 

. ·;.7 ,,/ /Jct"»~~ /// P:-;(--w.,,e:f?};,~:: :._~ Harrod G. 1!Iiller, 

Captain, Sign~l Corps. 

'/JJ~uo~~ William F. Fried£a.~. - - ~ 

L--~··""------~-··---·--"~---,~-·· ---·--- ··---··-------· ·-· -- . ·-------·--.Jo...-. ·-~·K.:.-:..:.: .... • ·--------
Spool 

Ste.e.1 

Modulator 

Tape.TRANSMITTER 

Rece.\vin.9 --- Atnpl i£ ier 

Ste.e.I 

Tape. 

o' c' a' l~pye.1s;;M~n~s 

RECEIVER 

S=Se.cYe.-i Lar1.9~CJe. 

P= P\da n Lon.9ua9e . 

output 

I Amplit\&\" .,_ __ _ 

-----F'e.ed Baclc 

Out pvt. 

SYSTEM ANO MEANS FOR ENCIPHERING ANO DECIPHERING 

MAGNETICALLY-RECORDED SIGNALS. 

Transmittin,; end: llectricAl 01cillation1 corre1pondin,; to input sisnals are recorded megneticelly on a movin& metal tape, the ta~e passint; Sltece1Fivel7 between the paired impressing magnets ABCD which are in 

aeries. 'l'hus. the tinal or resultant magnetisation of the tape correspon~s to a ce~uence ot blocks ot 

algebraically superimposed frequencies representable by the sequence .A., AB, ABC, ABCD, BCDE. CDEJ', •••• the 11.A." block comiq at the head ot the train. When the record ii paHed between the paired re&ding ~eta at 

2, signals correapondill£ to the resultant masnetisation are emitted or tr~nsmitted. These are enciphered 

dgnal1. ,...,. P.e~aiTing end: 'l'he impressing i:;agneta, 3, record the received signals J1111gneticall7 on a metal tape movint: 

at ap~roximetely the same rate ot speed as at the transmitting end. The record passes between the paired 

mar.nets at ~. The magnet .11 is a reading magnet and its output is led to the amplifier, where part of the enera h translated into final output, and part is fed back into the impressing magnets B', c•, and D'. 

The.•lectrical circuit• are 1uch a1 to cau1e the teed-back alternations impre11ed on B', C' and D' to be 

ot op~osite phaae trom the alternation• ted by A' into the amplifier. This results in neutraliring and 

removi111: the homologous magnetic equivalents on the tape, leaTiZJC only the orif;inal ~lain lftll«Uege on the 

tape when it reaches 1:111cnet A.1 • The signals at this point are deciphered signals. 

I 
.... 

r 

, 

OCSig0-334°. 7-Si.i• ~· 

Pa.tent Boaru. 

11!140r.J1100!l FOB: 

REF ID:A105055 

WAR DEPARTMENT 

OFFICE OF THE CHIEF SIGNAL OFFICER 

WASHINGTON 

aii~tain H .. G. Sillez• 

ii-. I. F. Friedm!Ul 

10 

8epte:iler 11 19~G. 

1. The (Jittac...1led i.rlvC!'ltion is considered to be of insufficie::it 

"llilitary value to warrant _pro::ecution o:f pe.tent by the liar liepe.rtme!lt .. 

'!'his office has no obJeetion, hoy;evert to ;your appl,ying for patent on 

this invention provided such ap~lic;;tion is prosecuted without expen~e 

to the 'far Dej.l&rt..'.!lent. 

Att~ched: Invention 5-12-56 

Louis E. Bender, 

Lieat. Col., Signal Corps. 

lst Memo Ind. 

WaphiD.gton,, D .. c., December 17~ 1936 - Toz O~I.C., Research and 

Development Di'Viaion, OCSigO. 

1. Upon the occasion of the recent visit by the undersigned 

to the Signal Corps Laboratories, thia ._~tter was discussed with 

laboratories _personnel, with the result th9.t the proposed system. 

appe!U"s more feasible than 11:!!.S .formerly thought by them. It was 

also brought out that it is possible th!!t the system might have 

distinct m.ilita17 applications, espeoiil~ in view or the increase 

in use or radiotele.Pho:D¥"• 

2. For the roregoinc reason, it is requested that this case 

be reaubaitted to the 81.gns.l Corps Patents Board for reconsideration 

ot »re"'lioue action. 

Attached (no change} 

• C,u. .. t-1 {-.-... 1.,.,.-"-_ t\.: .. '• .-;t W' '··""'-' 

.Harrod G. Killer, 

Captain, Signal Corps. 

111Ua:a ·r. Friedman. 

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