Patents by Inventor Douglas C. Hamilton

Douglas C. Hamilton 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: 7627279
    Abstract: A fuser assembly configured to fix a toner image to a sheet of print media includes a fuser belt having a first side edge, a second side edge spaced apart from the first side edge, an exterior surface, an interior surface, and a hollow interior defined by the interior surface. A pair of end cap assemblies is positioned to locate the fuser belt, and the fuser belt is positioned between and supported by the pair of end cap assemblies. Each end cap assembly of the pair of end cap assemblies includes an end cap body and a belt support mechanism. The belt support mechanism is coupled to the end cap body for supporting the fuser belt and is configured to be compliant in a direction perpendicular to a rotational axis of the fuser belt to apply a biasing force to the interior surface of the fuser belt.
    Type: Grant
    Filed: August 16, 2007
    Date of Patent: December 1, 2009
    Assignee: Lexmark International, Inc.
    Inventors: Jeffrey Allen Ardery, Douglas C. Hamilton, Jason Kyle Romain
  • Publication number: 20090047047
    Abstract: A fuser assembly configured to fix a toner image to a sheet of print media includes a fuser belt having a first side edge, a second side edge spaced apart from the first side edge, an exterior surface, an interior surface, and a hollow interior defined by the interior surface. A pair of end cap assemblies is positioned to locate the fuser belt, and the fuser belt is positioned between and supported by the pair of end cap assemblies. Each end cap assembly of the pair of end cap assemblies includes an end cap body and a belt support mechanism. The belt support mechanism is coupled to the end cap body for supporting the fuser belt and is configured to be compliant in a direction perpendicular to a rotational axis of the fuser belt to apply a biasing force to the interior surface of the fuser belt.
    Type: Application
    Filed: August 16, 2007
    Publication date: February 19, 2009
    Inventors: Jeffrey Allen Ardery, Douglas C. Hamilton, Jason Kyle Romain
  • Patent number: 7102824
    Abstract: An optical element is provided that may be used for collecting optical radiation incident at large angles of incidence. The element may include a grating window formed of grating elements that may collect large incident angle radiation and reflect that radiation, e.g., under total internal reflection in a substantially normal direction. A lens or lens array may be used to collect the internally reflected radiation and focus that radiation to a detector. Example detectors include infrared detectors. The element may be formed to collect, reflect, and redirect optical radiation incident at angles above 45° as measured from a surface normal to a detector oriented substantially at normal incidence. The detected signal from the optical element may be used to control systems within an aircraft or other vehicle capable of flight.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: September 5, 2006
    Assignee: The Boeing Company
    Inventors: Roy Clark, Douglas C. Hamilton
  • Patent number: 6084049
    Abstract: A release agent composition for use in an electrophotographic process is disclosed. This composition includes a specifically-defined heat-stable silicone oil-silicone wax random copolymer. The copolymer has a melting point such that it is liquid on the hot fuser roll, but solidifies at room temperature on the printed page. A random silicone copolymer, in the form of a paste or pliable caulk, which is useful for sealing leaks in toner cartridges is also disclosed. Finally, the method for preparing these copolymers is disclosed.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: July 4, 2000
    Assignee: Lexmark International, Inc.
    Inventors: Bradley L. Beach, Kathryn E. Dowlen, Terence E. Franey, Douglas C. Hamilton, Gerald G. Leslie, Alexander D. Meade, Jing X. Sun, Peter E. Wallin
  • Patent number: 5959056
    Abstract: A release agent composition for use in an electrophotographic process is disclosed. This composition includes a specifically-defined heat-stable silicone oil-silicone wax copolymer. The copolymer has a melting point such that it is liquid on the hot fuser roll, but solidifies at room temperature on the printed page. A random silicone copolymer, in the form of a paste or pliable caulk, which is useful for sealing leaks in toner cartridges is also disclosed. Finally, the method for preparing these copolymers is disclosed.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: September 28, 1999
    Assignee: Lexmark International, Inc.
    Inventors: Bradley L. Beach, Kathryn E. Dowlen, Terence E. Franey, Douglas C. Hamilton, Gerald G. Leslie, Alexander D. Meade, Jing X. Sun, Peter E. Wallin
  • Patent number: 5325166
    Abstract: A printer for fusing images on sheets of at least three width size categories including small, medium, and large is operated by control through a microprocessor assigning -7 to full size sheets, +13 to small size sheets and +17 to envelopes. These are accumulated until the count reaches 127, at which the interpage gap is adjusted based on which of those three categories is being printed and which of the three categories will next be printed. This maximizes throughput without requiring a thicker fuser.
    Type: Grant
    Filed: June 18, 1993
    Date of Patent: June 28, 1994
    Assignee: Lexmark International, Inc.
    Inventors: Douglas C. Hamilton, David B. Langer, Phillip B. Wright
  • Patent number: 5191375
    Abstract: Fixing of images by fuser roller (3) in printer (1) is delayed by control of paper feed clutch (7) when abnormally low power is determined during an earlier cold start or start from standby. Sensed temperature values from thermistor (9) are compared with predetermined value in comparator (15) under control of microprocessor (14). When the time period for heating is longer than a predetermined time, subsequent activation of the clutch is briefly delayed.
    Type: Grant
    Filed: February 14, 1992
    Date of Patent: March 2, 1993
    Assignee: Lexmark International, Inc.
    Inventor: Douglas C. Hamilton