Patents by Inventor Roger Edward Holtz

Roger Edward Holtz 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).

  • Power-up system for line-powered telephones
    Patent number: 5943420
    Abstract: A speaker-phone telephone, in which a speaker-microphone unit is powered by wall current, and a separate telephone is separately powered, by telephone line current. The speaker-microphone unit contains a switch by which a user can call for a speaker-phone call. The switch initiates a signal, which is held in existence, until a microprocessor detects the signal, and removes it.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: August 24, 1999
    Assignee: Lucent Technologies, Inc.
    Inventors: Frederick Joseph Bonhomme, Roger Edward Holtz
  • Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network
    Patent number: 3963876
    Abstract: A telephone amplifier circuit comprising a transmit amplifier and a receive amplifier provides gain in both the transmit and the receive directions. Loss is voice-switched into the receive amplifier in response to the sum of the transmit and receive speech levels to provide sidetone and gain control.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: June 15, 1976
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Roger Edward Holtz, Roger Allen Radosevich