Patents by Inventor Frederick A. Duimstra

Frederick A. Duimstra 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: 5003275
    Abstract: A non-latching relay switch assembly which includes a coil section and a switch or contact section. The coil section includes a permanent magnet and an electromagnet. The respective sections are arranged in separate locations or cavities in the assembly. The switch has a "normal" position and is selectively switched by an overriding electromagnetic assembly. The switch returns to the "normal" position when the overriding electromagnetic assembly is inactive.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: March 26, 1991
    Assignee: Babcock, Inc.
    Inventor: Frederick A. Duimstra
  • Patent number: 4998082
    Abstract: A latching relay switch assembly which includes a coil section and a switch or contact section. The coil section includes at least one permanent magnet and at least one electromagnet. The respective sections are, generally, arranged in separate locations or cavities in the assembly. The switch is latched by a permanent magnet assembly and selectively switched by an overriding electromagnetic assembly.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: March 5, 1991
    Assignee: Babcock, Inc.
    Inventor: Frederick A. Duimstra
  • Patent number: 4906962
    Abstract: A spring powered switching mechanism in which the energy required to complete switching is stored in a spring (or springs) which are constrained in a "cocked" or stressed condition by a fuse wire. The fuse wire has the characteristic of having a relative flat coefficient of resistivity over a large temperature range. The mechanism is operative to close (or open) electrical circuits permanently upon receipt of the appropriate electrical signal to the "fuse" or "bridge" wire which is caused to break as a result of the receipt of the electrical signal.
    Type: Grant
    Filed: January 5, 1989
    Date of Patent: March 6, 1990
    Assignee: Babcock, Inc.
    Inventor: Frederick A. Duimstra