Patents by Inventor Ulo Tamm

Ulo Tamm 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: 5072327
    Abstract: An electronic protection device without moving parts uses an automatically-resetting overcurrent protection element, such as positive temperature coefficient device, and keeps its alarm contact terminal constantly in contact with the alarm contact point of a fuse mount. A coil spring is used not to move the alarm terminal but merely to constantly hold the alarm terminal in contact with the alarm point of the fuse mount. A transistor in the electric protection device has its base bias determined by the state of the overcurrent protection element, and has one of its other leads connected to the alarm terminal to generate thereat signals representative of the state of the overcurrent protection element without moving the alarm terminal.
    Type: Grant
    Filed: January 24, 1990
    Date of Patent: December 10, 1991
    Assignees: AT&T Bell Laboratories, Illinois Tool Works, Inc.
    Inventors: Dieter J. H. Knollman, Ulo Tamm