Patents by Inventor Lawrence R. Groehl

Lawrence R. Groehl 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).

  • Substantial nullification of external magnetic fields and lorentz forces regarding toroidal inductors
    Patent number: 5565835
    Abstract: Main and supplemental windings are combined in a toroidal inductor to subntially nullify Lorentz Forces on the main winding and the magnetic field thereof which passes externally from the inductor.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: October 15, 1996
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Lawrence R. Groehl
  • Nullification of magnetic fields relative to coils
    Patent number: 5565836
    Abstract: The internal and/or external magnetic fields of a coil are nullified to ad structurally detrimental Lorentz Forces and/or environmentally hazardous magnetic fields, in accordance with preestablished design objectives.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: October 15, 1996
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Lawrence R. Groehl, John M. O'Meara
  • Abnormal battery cell voltage detection circuitry
    Patent number: 5302902
    Abstract: Defective battery cells are detected by individually monitoring the voltage utput therefrom, which characteristically becomes abnormal when the defective condition occurs. Each cell is independently referenced to a common ground by its voltage monitoring device which drives a level sensing comparator that generates a control signal when the output voltage from that cell becomes abnormal. This control signal drives at least one switch to indicate when the defective condition occurs.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: April 12, 1994
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Lawrence R. Groehl
  • Null offset voltage compensation for operational amplifiers
    Patent number: 4983926
    Abstract: The null offset voltage of an operational amplifier is compensated with des connected at the output terminal thereof. These diodes are either forward biased and/or backbiased to block current flow from the operational amplifier until the output voltage thereof exceeds the offset voltage level.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: January 8, 1991
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Lawrence R. Groehl