Patents by Inventor Gregg L. Buchanan

Gregg L. Buchanan 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).

  • Film resistor with enhanced trimming characteristics
    Patent number: 5015989
    Abstract: A film resistor for use in electrical circuits, the resistor including a shunt conductor electrically connected in parallel with a portion of the resistive film, at a location spaced apart from the principal circuit conductor terminals of the resistor. The resistor is made with an intentionally low initial resistance, and is trimmed to a predetermined resistance by removal of a portion of the resistive material between the circuit conductor terminals. A plunge cut made in the resistive material by a trimmer and extending toward the shunt conductor can be used to provide a wide range of change of resistance without excessive increase of the rate of change of resistance as a function of extension of the plunge cut.
    Type: Grant
    Filed: July 28, 1989
    Date of Patent: May 14, 1991
    Assignees: Pacific Hybrid Microelectronics, Inc., N.W. Silicon Specialists, Inc.
    Inventors: Paul D. Wohlfarth, Gregg L. Buchanan