Patents by Inventor Frank Holt

Frank Holt 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).

  • Microwave diode switch wherein first diode carries greater control signal current than second diode
    Patent number: 3959750
    Abstract: A p-i-n diode microwave switch is disclosed capable of hot switching relatively high power microwave energy while maintaining high isolation between the input and outputs. To accomplish the high isolation at high power operating levels multiple p-i-n diodes are utilized with different forward and reverse bias potentials being applied to different diodes.
    Type: Grant
    Filed: May 22, 1975
    Date of Patent: May 25, 1976
    Assignee: Sanders Associates, Inc.
    Inventor: Frank Holt
  • Treatment process
    Patent number: 3950182
    Abstract: Minerals, including metal ores, fillers and coal, are ground with a grinding aid which is an ionic polysaccharide, particularly sodium carboxymethyl cellulose.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: April 13, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventors: Margaret Lilian Steel, Frank Holt