Patents by Inventor Mervyn Bradshaw Johnston

Mervyn Bradshaw 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).

  • Patent number: 6853274
    Abstract: A circuit breaker having a manual control, an over-center contact mechanism, and a magnetic current sensing coil, wherein said an over-center contact mechanism is disposed between said external manual control and said sensing coil. For example, a collapsible toggle linkage selectively applies a force along an axis, which generally intersects the coil. The circuit breaker has a housing for a contact mechanism having a contact bar rotational axis. The magnetic sensing coil of the circuit breaker is not disposed between the contact mechanism and a side wall of the housing.
    Type: Grant
    Filed: June 19, 2002
    Date of Patent: February 8, 2005
    Assignee: Airpax Corporation, LLC
    Inventors: Jonathan Edward Millburn, Noel Keith Ware, Mervyn Bradshaw Johnston
  • Publication number: 20020196108
    Abstract: A circuit breaker having a manual control, an over-center contact mechanism, and a magnetic current sensing coil, wherein said an over-center contact mechanism is disposed between said external manual control and said sensing coil. For example, a collapsible toggle linkage selectively applies a force along an axis, which generally intersects the coil. The circuit breaker has a housing for a contact mechanism having a contact bar rotational axis. The magnetic sensing coil of the circuit breaker is not disposed between the contact mechanism and a side wall of the housing.
    Type: Application
    Filed: June 19, 2002
    Publication date: December 26, 2002
    Inventors: Jonathan Edward Millburn, Noel Keith Ware, Mervyn Bradshaw Johnston
  • Patent number: 6031196
    Abstract: A push button switch assembly and method according to which a button is mounted to a partition and has at least one hook for engaging a ledge of the partition. At least one post extends from the button and through an opening in the partition and is fastened to the partition for mounting the button to the partition for pivotal movement which is limited by the engagement of the hook with the ledge. A membrane switch is mounted on the partition, and a bumper extends from the button for engaging the membrane of the switch to activate same. The bumper is fabricated from a silicone rubber to minimize the effects of relatively large pushing forces acting on the button and to enable the assembly to be used in relatively low temperature environments.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: February 29, 2000
    Assignee: Dresser Industries, Inc.
    Inventor: Mervyn Bradshaw Johnston
  • Patent number: 5941372
    Abstract: A push button switch assembly and method according to which a button is mounted to a partition and has at least one hook for engaging a ledge of the partition. At least one post extends from the button and through an opening in the partition and is fastened to the partition for mounting the button to the partition for pivotal movement which is limited by the engagement of the hook with the ledge. A membrane switch is mounted on the partition, and a bumper extends from the button for engaging the membrane of the switch to activate same. The bumper is fabricated from a silicone rubber to minimize the effects of relatively large pushing forces acting on the button and to enable the assembly to be used in relatively low temperature environments.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: August 24, 1999
    Assignee: Dresser Industries, Inc.
    Inventor: Mervyn Bradshaw Johnston