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Files W.F.F. Archive Patent and Equipment Records Memoranda, License, Descriptions, Diagrams, M-138 Patent Application, SISDE 15 & 16, Application No. 300,212, US Patent No. 2,395,863, Issued 5 March 1946, 1929-1946
Amendment Responsive to Patent Office Action Dated November 9 1939, 7 May 1940; Serial No. 300212
Document A67550
221 KiB
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Application for Letters Patent of the United States for A Cryptographic Device, 16 October 1939
Document A67549
54.45 KiB
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Application for Patent Serial No. 300,212-W.F. Friedman, 17 December 1945
Document A67544
21.04 KiB
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Cryptographic Material Issued to Foreign Nations, January 1946; Converter M-228 and Alphabet Strips
Document A67539
122.56 KiB
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Department of Commerce Letter to William F. Friedman
Document A4161606
36.67 KiB
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Draft Specifications for Basis of Patent Application on Cipher Device Type M-138; SISDE 15 and 16
Document A67592
733.04 KiB
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Inventor Claims for Cryptographic Invention, Patent No. 300,212, 1 January 1939; SISDE 15 and 16
Document A67556
318.27 KiB
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Memo: Additional Information Regarding Cryptographic Material Issued to Foreign Nations, January 1946; Converter M-228
Document A67540
97.27 KiB
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Memorandum on Cipher Device Type M-138, 13 March 1936; SISDE 15 and 16
Document A67563
34.88 KiB
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Memorandum on Cipher Device Type M-138; SISDE 15 and 16
Document A67561
81.22 KiB
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Memorandum Re Cipher Device M-138, Sectionalized Type
Document A67557
34.64 KiB
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Memorandum Re Cipher Device, M-138
Document A67558
32.09 KiB
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Notice of Application Examination Patent Ser. No. 300,212
Document A67553
93.24 KiB
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Notification That Patent Application Contains Information Detrimental to Public Defense
Document A67547
47.02 KiB
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Objective of Cryptographic Invention, 1 January 1939; SISDE 15 and 16
Document A67554
318.2 KiB
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Patent Application #300212 on A Cryptographic Device, 8 July 1940
Document A67548
30.71 KiB
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Patent Application of William P. Friedman, Serial No. 300, 212, Filed 19 October 1939, for Cryptographic Devices; Patent No. 2395863
Document A67543
47.07 KiB
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Patent Application, Ser. No. 300,212, Cryptographic Device (M-138a)
Document A67552
43.22 KiB
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Personal Folder on M-138 Patent Application; SISDE-15 & 16, 5 March 1946; Application # 300212; Patent No. 2395863
Document A67538
27.66 KiB
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Proposed Change In the Construction of Cipher Device M94, 13 July 1929; SISDE 15 and 16
Document A67596
116.08 KiB
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Release of Patent Application Serial No. 300,212, 19 October 1939, 18 September 1945
Document A67545
29.26 KiB
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Request for Information Regarding Mr. Friedman's Employment Regarding Inventions; SISDE 15 and 16
Document A67566
42.87 KiB
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Revised Draft of Specification and Drawings Covering Hand-Operated Cryptographic Device; SISDE 15 and 16
Document A67560
446.68 KiB
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