03938091 is referenced by 158 patents and cites 4 patents.

A customer code word issuing machine is provided wherein a customer manually inputs to the machine his secret password. The machine encodes the password and displays his corresponding issued code word. A verification machine is provided which includes a dial or keyboard for manually inputting the customer's password and the issued code word. The verification machine encodes the inputted password to derive an output for comparison with the manually inputted code word to derive an output indicative of the truth or falseness of the match of the code word with the respective password. The verification machine may be employed to open a lock, to allow use of a credit card for a telephone call, purchase of goods, etc.

Title
Personal verification system
Application Number
235641
Publication Number
3938091
Application Date
July 19, 1974
Publication Date
February 10, 1976
Inventor
Alexander F Liu
San Jose
CA, US
Martin M Atalla
Portola Valley
CA, US
Agent
A C Smith
Assignee
Atalla Technovations Company
CA, US
IPC
G06K 9/00
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