Patents by Inventor Dewayne H. Meyer

Dewayne H. Meyer 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).

  • High security door locking device
    Patent number: 4909053
    Abstract: A High Security Door Locking Device comprises a locking cylinder including a latch control cam rotatably operable by a properly formed key received within the cylinder. An electrical solenoid is inserted into the rear of the cylinder with a retractable core which interferes with the operation of the latch control cam when the solenoid is unoperated. A solenoid controller is connected to operate the solenoid in response to entry of a defined code into the solenoid controller to thereby permit operation of the latch control cam. The solenoid controller operates the solenoid only for a selected period of time in response to the entry of a defined code such that a valid code must once again be entered into the controller if the cylinder is not operated during the enabled time period.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: March 20, 1990
    Assignee: Liberty Telephone Communications, Inc.
    Inventors: Walter O. Zipf, III, Jack E. Zipf, Kenneth W. Wheatley, Dewayne H. Meyer