Patents Assigned to EFI Corporation
  • Surge suppression circuit for high frequency communication networks
    Patent number: 5124873
    Abstract: A surge suppression circuit for use in a high frequency communication network, having a primary line and a ground line, includes a gas tube connected between the primary line and ground line, a bi-directional avalanche diode and one or more ferrite beads connected in series between the primary line and ground line, and a metal oxide varistor connected in series in the primary line.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: June 23, 1992
    Assignee: EFI Corporation
    Inventors: John M. Wheeler, Michael F. Stringfellow
  • Method and apparatus for a transient-suppression network
    Patent number: 4630163
    Abstract: An electrical circuit and method for use in suppressing source and load-side transients appearing on a power-supply line. The circuit includes a high-speed clamping stage, a high-energy clamping stage, and a highly efficient LC filter for dissipating harmonic voltage and current caused by clamping the transient. A third clamping stage may be included so as to provide for common-mode suppression.
    Type: Grant
    Filed: January 31, 1985
    Date of Patent: December 16, 1986
    Assignee: EFI Corporation
    Inventors: Howard C. Cooper, Carl M. Rasmussen, Perry N. Law