Patents by Inventor Lawrence C. Brownfield

Lawrence C. Brownfield 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).

  • Electronic access control device utilizing a single microcomputer integrated circuit
    Patent number: 5617082
    Abstract: An electronic access control system for controlling a lock in which the inputs and outputs are multiplexed, the electrically programmable read only memory is written to and read from in a serial manner, and the operator can disable access codes and enable access codes in one operation. The device reduces power consumption when powering a solenoid or DC motor by pulsing the output power. Further, the device is able to be operated in a remote location whereby the remote device can accept inputs from a keypad, an electronic signal, or a telephone line. The remote device, when not in active operation, operates in a low power mode so that the remote device may be powered by a battery.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: April 1, 1997
    Assignee: Micro Enhanced Technology, Inc.
    Inventors: William D. Denison, Lawrence C. Brownfield, Bradley S. Silvers