Patents by Inventor Bjorn E. Valeur

Bjorn E. Valeur 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).

  • Zero-current a.c. switching system
    Patent number: 4670810
    Abstract: A zero-current a.c. switching system is provided for controlling actuation of relay contacts between a power supply and a load. A primary switch selectively energizes the relay to maintain the relay contacts in the closed state. The load current flowing through the relay contacts to the load is sensed. A secondary switch responds to the sensed load current for normally conducting to energize the relay in parallel with the primary switch. The secondary switch ceases conducting each time the load current drops below a predetermined level to cease energizing the relay and open the relay contacts the next time the load current drops below the predetermined level following the opening of the primary switch.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: June 2, 1987
    Assignee: Electronic Instrument & Specialty Corp.
    Inventor: Bjorn E. Valeur