Patents by Inventor Charles A. Vollum

Charles A. Vollum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cryptographic based electronic lock system and method of operation
    Patent number: 4837822
    Abstract: The present invention relates to electronic locks and electronic locking systems, to electronic locking systems which use remotely encoded keycards and, in particular, to an electronic locking system which utilizes public key cryptography.
    Type: Grant
    Filed: April 8, 1986
    Date of Patent: June 6, 1989
    Assignee: Schlage Lock Company
    Inventors: Thomas W. Crosley, Wayne Davison, James R. Goldberg, Leonard L. Hofheins, Ronald D. Lichty, Charles A. Vollum, Stephen H. Vollum, Victor H. Yee