Patents by Inventor Engelbert W. Kehren

Engelbert W. Kehren 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: 4012601
    Abstract: An automatic dial for a subscriber telephone utilizes a keyboard array to enter coded information into an integrated circuit digit processor. The digit processor includes a programmed ROM for storing an instruction set to control the operation of the dial, an arithmetic/logic unit for performing arithmetic and logic operations on data according to said instruction set, and a first read/write RAM for storing the data being processed. A second integrated circuit RAM, which is selectively connected to the output of the digit processor, is provided for the storage and retrieval of changeable groups of selected telephone numbers. A pulse or tone generator is also selectively connected at the output of the digit processor for the selective transmission of pulse or tone signals over the telephone lines according to the stored instruction set and coded information derived from the keyboard.
    Type: Grant
    Filed: April 4, 1975
    Date of Patent: March 15, 1977
    Assignee: Texas Instruments Incorporated
    Inventor: Engelbert W. Kehren