Patents by Inventor Gerald E. Carlson

Gerald E. Carlson 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).

  • Patent number: 4340807
    Abstract: A controller having dedicated fuser circuitry and a processor for controlling the fuser heating element. The dedicated fuser circuitry interconnects an input voltage source to the processor through a low voltage power supply to provide a reference signal and a sample DC voltage signal representative of the input voltage source. The processor provides a digital signal to activate a triac connected to the fuser heating element. The triac, selectively gates the input voltage source across the heating element. A plurality of ranges of digital signals and a plurality of corresponding triac activation rates are provided for variations in input voltage. A digital signal related to a particular value of the input voltage source lies within one of the plurality of ranges determining the particular activation rate of the triac.
    Type: Grant
    Filed: January 10, 1980
    Date of Patent: July 20, 1982
    Assignee: Xerox Corporation
    Inventors: Jerome S. Raskin, Warren L. Hall, Charles P. Holt, Gerald E. Carlson
  • Patent number: 4303334
    Abstract: A heat regulator for a fuser in a reproduction machine. The heat regulator includes a fuser cooling fan, and a controller having a cooling fan counter. The cooling fan counter manifests the number of copies reproduced up to a predetermined maximum in response to a document scan switch. The contents of the cooling fan counter is the basis for determining the length of time of operation of the cooling fan at the end of a reproduction run. Specifically, the machine cooling fan maintains operation during machine cycle out at the end of a reproduction run for a three second period for each count in the cooling fan counter up to a predetermined maximum.
    Type: Grant
    Filed: October 1, 1979
    Date of Patent: December 1, 1981
    Assignee: Xerox Corporation
    Inventors: George J. Haupt, Gerald E. Carlson, Eugene S. Evanitsky
  • Patent number: 4297029
    Abstract: Diagnostic capability is provided by setting a machine in a jam condition and using non-diagnostic dedicated circuitry. A selector switch is switched from a first predetermined number to a second predetermined number while simultaneously activating a start operation switch. Machine logic is then advanced to a diagnostic state. To exit the diagnostic state, a routine jam clearance is accomplished and the machine returns to the stand by state for normal operation.
    Type: Grant
    Filed: April 9, 1979
    Date of Patent: October 27, 1981
    Assignee: Xerox Corporation
    Inventor: Gerald E. Carlson