Patents by Inventor Bernhard K. Donath

Bernhard K. Donath 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).

  • Patent number: 4209782
    Abstract: A safety system comprising closure means, hereinafter termed locks, and associated closure release means, hereinafter termed keys, which operate electronically and which grant access. The lock release is dependent on the agreement or coincidence of a variable lock/key code pair. Random codes are employed which are altered either automatically each time a lock is actuated or only as required. A plurality of locks can be actuated by a common key which possesses another variable code for each lock. In addition, a plurality of keys can actuate a common lock which possesses another variable code for every key. Both possibilities can be combined, since every key and every lock possesses another associated code pair whose association is automatically produced when a lock is actuated. By means of a central key which is safeguarded in the same manner, the user can produce and vary any desired lock/key association so as to eliminate misuse.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: June 24, 1980
    Assignee: Maximilian Wachtler
    Inventors: Norbert W. Donath, Bernhard K. Donath