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William Friedrich Ehrsam
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Hurley, NY, US
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last 30 patents
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Patent Grant
Cryptographic communication and file security using terminals
Patent number
4,386,234
Issue date
May 31, 1983
International Business Machines Corp.
William F. Ehrsam
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Cryptographic file security for single domain networks
Patent number
4,238,854
Issue date
Dec 9, 1980
International Business Machines Corporation
William F. Ehrsam
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Cryptographic communication security for single domain networks
Patent number
4,238,853
Issue date
Dec 9, 1980
International Business Machines Corporation
William F. Ehrsam
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Cryptographic communication security for multiple domain networks
Patent number
4,227,253
Issue date
Oct 7, 1980
International Business Machines Corporation
William F. Ehrsam
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Cryptographic file security for multiple domain networks
Patent number
4,203,166
Issue date
May 13, 1980
International Business Machines Corporation
William F. Ehrsam
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Message verification and transmission error detection by block chai...
Patent number
4,074,066
Issue date
Feb 14, 1978
International Business Machines Corporation
William F. Ehrsam
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Product block cipher system for data security
Patent number
3,962,539
Issue date
Jun 8, 1976
International Business Machines Corporation
William Friedrich Ehrsam
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Block cipher system for data security
Patent number
3,958,081
Issue date
May 18, 1976
International Business Machines Corporation
William Friedrich Ehrsam
H04 - ELECTRIC COMMUNICATION TECHNIQUE