Patents by Inventor Donn A. Wahl

Donn A. Wahl 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: 3973242
    Abstract: A digital receiver for receiving 8-bit permutable address code words. Before receiving each address code word the receiver must be activated by receiving five consecutive identical words of an interdigit signal of alternating 1's and 0's. The receiver must then receive the same address code word five times in succession in order to accept it. The incoming signals are applied to a 9-bit shift register. Each bit is counted by a counter, but if the bits in the first and ninth stages of the shift register are different, the counter is cleared. When the count in the counter indicates five identical 8-bit words have been received in succession and an interdigit detector detects that the word in the last eight stages of the shift register is an interdigit word, a state flip-flop is set activating the receiver.
    Type: Grant
    Filed: February 27, 1975
    Date of Patent: August 3, 1976
    Assignee: GTE Sylvania Incorporated
    Inventors: Robert G. Field, Donn A. Wahl