Patents by Inventor Mervyn B. Johnston

Mervyn B. Johnston 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).

  • Apparatus comprising circuit breaker with adjunct sensor unit
    Patent number: 7423858
    Abstract: A self-contained current sensor unit is integrated with a standard circuit breaker as an attachment to the circuit breaker that requires minimal modification of the circuit breaker and that becomes an extension of the case of the circuit breaker. The current sensor unit includes a magnetic structure with a programmable Hall Effect device and may include a power supply, a Hall Effect voltage regulator, and an output signal conditioner.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: September 9, 2008
    Assignee: Airpax Corporation
    Inventors: Eugene F. Dobbs, Mervyn B. Johnston, Noel Keith Ware
  • Exhaust port of two cycle engine
    Patent number: 3945354
    Abstract: The exhaust port of a spark ignition two cycle engine has the general shape of an inverted T with a base portion and a narrower upwardly extending stem portion. The top of the base portion is approximately at the level of the top of the transfer port which admits fuel-air mixture to the engine cylinder. The top of the stem is from 20.degree. to 55.degree. of crankshaft rotation in advance of the opening of the transfer port. This configuration of the exhaust port produces a low broad blowdown pulse which in turn results in a low noise level of the exhaust.
    Type: Grant
    Filed: August 9, 1973
    Date of Patent: March 23, 1976
    Assignee: Textron Inc.
    Inventor: Mervyn B. Johnston