Patents by Inventor Earl Stephans

Earl Stephans 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).

  • Cermet resistor trimming method
    Patent number: 4191938
    Abstract: A method for laser trimming of resistors which includes sputter depositing or vaporizing resistor material in a limited area but the resistor geometry and trimming location is designed to achieve a maximum resistor trimming range with a minimum substrate area occupied by the resistor. A cermet resistor is fabricated on a metallized ceramic substrate with the resistor having a low length to width ratio. A laser cut is used to provide resistor values greater than 250 ohms and up to 16000 ohms.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: March 4, 1980
    Assignee: International Business Machines Corporation
    Inventors: John Gow, 3rd, Herman S. Hoffman, Earl Stephans