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• REF ID:A67498 

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hmorad• Por ...... w11u.aa :r. Frl•dman 

anll Jl'rak I. 'Ro9lett. 

W 1 aAd T »1Yl•1 ... Ottioe of ~ Olal•f ISgDal Oft!oer, 

Malt1011• hll-dtig, '!amhlns'\on. ».c. 

SubJae'h lapro...-t l:n Crntcgra'Pll•, 

Patent AJpl1oa~1on, ~er. •o. ?0,61&, 

Piled. .. !arch 2;~. l9Z6. 

1. 'fta1• l• to ad.Tl• 1n '1iat the allow 1den11tied appl1cat1• 

ha• bee 'Jlaeed. oa file in the P&'*' ott1oe mar fll1n£ date ant lerlal 

.VU.bar a• ln4loated. 

2. A co.plate ~op1 ot the an~cif"lo&,ion and clatm1 Al file• 1 ~• 

u'ra eopJ of the cl&lll• &loae an4 copie• tn 4u:pUca'9 ot tbe 4rftW Snca- as 

fUed. are tnnmit'\ed. Mrewlth t•r 1n.r nooria. 

1. Contlralac JAl'll.gl'apla I or .... 4ate4. s-11-111 •te:P• will bt 

..._n w lnYOke the 'PJ'0•1•1- ot S.ott.or.. 48-9"&. :i.a. an&t. at P!.11 earl1 d&te 

...... &!'1 4oc11Rnta •111 lie 'rauai t\etl f"or .ucu•Uo.a,alld. other neoe•••J7 

torllllttl•• to tha• ent will Jla,. attention~ 

- J7 older ot "be Oht•t Signal ott1ou. 

Carle• A. I.._, 

h'•ut• 1.n1e, St«n&l Corpe 

Confidential 

!Declassified and approved for release by NSA on 09-09-2013 pursuant to E. 0. 1352§ 
• 

lit llao Ind. 

SI31 IP&T Dh·., OCS1g01 April 2, 1936 - 'l'oc The Cb1et SifMl 

Otticer, Ylallbington, D. c. 

The acooapa1171ng a•eirome.at ba•-. executed. 

B 

11111a• r. Pr1Mm.n. 

l'rank B. Rowlett 

Incl. 
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.a C) REF ID:A67498 D 

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A S S I G N M E N T 

WHEREAS we, William F. Friedman, of Washington, Diatrioi of 

Columbia, and Frank B. Rowlett, of Fast Falla Church, Arlington County, 

Virginia, whose address is Care Office of the Chief Signal Of_ficer, 

Munitions :Building, Washington, D.c., have invented certain improvements 

in Cryptographe, for which we have made a.n application tor Letter~ Patent 

of the United Sta.tee, Serial No. 70,412, filed March 23, 1936; and 

WHEREAS, the invention was ma.de while we were employees of the 

War DepartmAnt,· and pertaine to a device useful in the National Defense i 

and 

WHEP.EAS, the Government of the United States is desirous of acquiring the entire right, title and interest in and to the said invention 

and in and to any patents that may issue thereon) 

NOW, THEREFORE, in consideration of the premises and one ($1.00) 

dollar, the receipt of which is hereby acknowl0dged, we, William F. Friedman and Frank B. Rowlett, have sold, assigned, and transferred, and by 

these presents do hereby sell, assign, and transfer unto the Government 

of the United Sta tee of America, as represented by the Secreto,ry of War, 

the entire right, title and interest, throughout the United States of 

.America., and the territories and dependencies thereof, and not elsewhere, 

in and to the said invention relating to improvement in Cryptographs, 

e,s described, claimed and illustrated in t!1e aforesaid application, Serial No. 70,412, and e,11 Letters Patent ise11ed thereon and any continu.aitions, 
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REF ID:A67498 

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divisions, renewals, and reissues or extensions thereof ; reserving to 

ourselves and legal representatives ~n' irrevocable and assignable license, 

without payment of royalty, said license to be exclusive, except as to 

manufacture, use and / or sale by or for the United States Government, 

to make·, use and/ or sell and to license others to make use e:n.d/ or 

sell the subject matter of se.id invention relating to improvement in 

:,1 Cryptogre.phs, to the full end of the term or terms for which Lettere 

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Patent or any divisions, reissues, renewals, extensions or continuations 

thereof are or may be granted ; the said entire right, title and interest 

to be held by the Goverrunent of the United States of hnerica, as represented 

by the Secretary of War and his successors in office, to the full end of 

the term or tenne for which said Letters Patent and any divisions, reissues, 

renewals or extensions thereof are or may be granted, as fu.lly and entirely 

as the ea.me would have been held by ue had this assignment and sale not 

been ma.de. 

Sworn to and subscribed by the said ~~ F. Friedman 

and Frank B. Rowlett before me this - day of 

~~A'Pr~HI ~;t9,36. ' •. • • ·-- ' .. I ~-~· ·· .. / 

t°/ .~RY·." 2: ~-~--- , ! .C'& ~ :':.. 

.# .. ..3r... 1,... " """-' • -.... RECORDED 

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