Patents by Inventor Bertram J. Chaffee

Bertram J. Chaffee 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).

  • Electrical circuit voltage and continuity testing device
    Patent number: 4152639
    Abstract: A circuit testing device comprises(a) a casing,(b) a single probe rigidly projecting from the casing whereby the casing may be manipulated to forcibly insert the probe into an electrical power socket, and(c) a presence-of-voltage circuit in the casing and electrically connected with the probe, said circuit including a presence-of-voltage indicator, and rectifier means and amplifier means electrically connected between the probe and the indicator.The device may also advantageously include a voltage level testing circuit, and an electrical continuity testing circuit.
    Type: Grant
    Filed: January 27, 1978
    Date of Patent: May 1, 1979
    Assignee: Mono-Probe Corporation
    Inventor: Bertram J. Chaffee
  • Electrical continuity and voltage testing device
    Patent number: 4015201
    Abstract: A circuit testing device includes a casing, two probes one of which projects from the casing, a voltage level testing circuit operatively connected with one probe and incorporating simple and advantageous circuitry including transistor amplifier means and indicator means, and an electrical continuity testing circuit connected between both the probes.
    Type: Grant
    Filed: December 30, 1975
    Date of Patent: March 29, 1977
    Assignee: Mono-Probe Corporation
    Inventor: Bertram J. Chaffee