Patents Assigned to Comdial Telephone Systems, Inc.
  • Push-button dial for a telephone
    Patent number: 4508938
    Abstract: A solid state push-button dial circuit in which a push-button key pad uses a simple on-off switch for each key to mute the receiver and open the circuit to the transmitter while a dial tone is being generated. The circuit, when operating with the speaker phone, mutes the speaker phone when the key is depressed. The phone can be easily switched to a polarity-sensitive state in which the tone generator is turned on only if the proper polarity is present on the telephone line.
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: April 2, 1985
    Assignee: Comdial Telephone Systems, Inc.
    Inventors: Ronald W. Bench, Edson S. Hineline, Jr.
  • Telephone
    Patent number: D278337
    Type: Grant
    Filed: January 27, 1983
    Date of Patent: April 9, 1985
    Assignee: Comdial Telephone Systems, Inc.
    Inventor: Ronald C. Banko