Patents Assigned to Walker Equipment Corporation
  • Noise cancelling telephone transmitter insertable in telephone handset receptacle
    Patent number: 4584702
    Abstract: A noise cancelling telephone transmitter comprising a cap and a cup coupled together so as to form an assembly insertable as a unit in the receptacle of a telephone handset. The cap is provided with an opening for passing sound. The inlet of the cap opening is covered by an acoustically deformable material such as a Mylar membrane. An electret microphone is mounted within the assembly such that the microphone acoustic entrance faces the outlet of the cap opening. A ring-shaped acoustic damping element is interposed between the cap underside and the plane of the microphone acoustic entrance. The cap is provided with a depending acoustic baffle which surrounds the damping element proximate the plane of the microphone acoustic entrance.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: April 22, 1986
    Assignee: Walker Equipment Corporation
    Inventor: Wesley F. Walker, Jr.
  • Telephone handset amplifier circuit
    Patent number: 4466120
    Abstract: A rocker switch is operated by the handset user to vary the impedance of a FET. The FET impedance varies in proportion to the duration of operation of the switch. The handset receiver "volume" increases or decreases in proportion to the FET impedance. An electret condensor microphone stabilizes the receiver supply voltage and provides improved transmitter linearity and low distortion.
    Type: Grant
    Filed: September 20, 1983
    Date of Patent: August 14, 1984
    Assignee: Walker Equipment Corporation
    Inventors: Wesley F. Walker, Jr., David Hanon
  • Anti-side tone transmitter
    Patent number: 4449236
    Abstract: Anti-side tone transmitter insertable in a telephone handset improves transmission of the speaker's voice without distortion in high ambient noise environments. The transmitter cap is provided with a central opening in communication with an electret microphone. One or more satellite openings are spaced from and at least partially surround the central opening. An acoustic damping element is located below the satellite openings. The electret microphone is mounted below the cap on a PC board which contains the transmitter circuitry. The PC board is seated on a shelf formed in the interior surface of the side wall of the transmitter cup. Conventional telephone handset cord transmitter wires may be connected to screw terminals on the base of the transmitter cup or to spade lugs mounted on the PC board.
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: May 15, 1984
    Assignee: Walker Equipment Corporation
    Inventor: Wesley F. Walker, Jr.
  • Telephone handset transmitter cup
    Patent number: D274429
    Type: Grant
    Filed: February 8, 1982
    Date of Patent: June 26, 1984
    Assignee: Walker Equipment Corporation
    Inventor: Wesley F. Walker, Jr.
  • Telephone handset transmitter cup
    Patent number: D274516
    Type: Grant
    Filed: February 8, 1982
    Date of Patent: July 3, 1984
    Assignee: Walker Equipment Corporation
    Inventor: Wesley F. Walker, Jr.
  • Handset telephone
    Patent number: D280504
    Type: Grant
    Filed: March 18, 1983
    Date of Patent: September 10, 1985
    Assignee: Walker Equipment Corporation
    Inventor: Wesley F. Walker, Jr.
  • Telephone handset amplifier circuit
    Patent number: RE33309
    Abstract: A rocker switch is operated by the handset user to vary the impedance of a FET. The FET impedance varies in proportion to the duration of operation of the switch. The handset receiver "volume" increases or decreases in proportion to the FET impedance. An electret condensor microphone stabilizes the receiver supply voltage and provides improved transmitter linearity and low distortion.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: August 21, 1990
    Assignee: Walker Equipment Corporation
    Inventors: Wesley F. Walker, Jr., David Hanon