Patents by Inventor Dennis D. Whitehead

Dennis D. Whitehead 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: 6681087
    Abstract: The present invention includes a method of sealing a toner supply to a developer sleeve including the steps of introducing a static-electric charge on toner particles to create charged toner particles and inducing an attractive charge onto each end of the developer sleeve. The static-electric charge and the attractive charge result in toner particles being attracted to the ends of the developer sleeve which create a barrier of charged toner particles to prevent leakage of the charged toner particles.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: January 20, 2004
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Dennis D. Whitehead, Brent L. Meyer
  • Publication number: 20030180069
    Abstract: The present invention includes a method of sealing a toner supply to a developer sleeve including the steps of introducing a static-electric charge on toner particles to create charged toner particles and inducing an attractive charge onto each end of the developer sleeve. The static-electric charge and the attractive charge result in toner particles being attracted to the ends of the developer sleeve which create a barrier of charged toner particles to prevent leakage of the charged toner particles.
    Type: Application
    Filed: March 21, 2002
    Publication date: September 25, 2003
    Inventors: Dennis D. Whitehead, Brent L. Meyer
  • Patent number: 6621996
    Abstract: A noncontact cleanerless system toner cartridge that uses an injection charging roller and toner with conductive particles is remanufactured into a conventional toner cartridge. The injection charging roller is removed and replaced with a primary charge roller. A cleaning blade to remove the residual toner from the organic photoconductive drum is added along with a seal to form a toner waste hopper area. The toner with the conductive particles is replaced with toner having magnetic particles.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: September 16, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Brenton L. Meyer, Dennis D. Whitehead, Patrick Dougherty
  • Publication number: 20020108439
    Abstract: A system for displaying status of a consumable resource. In the illustrative application, the invention provides a system for determining a resource characteristic, e.g. a level of toner, in a cartridge without requiring use of a host machine. In a first embodiment, an alpha-numeric visual display or an audio device is provided on the cartridge. In alternative embodiments, data relating the characteristic is transmitted from the cartridge by a wireless transmitter. In one implementation, the transmitter is an infrared transmitter. In a second implementation, the transmitter is a Bluetooth enable transmitter. The wireless transmission is received by a compatible receiving device, preferably a hand held device, remotely located relative to the cartridge. An alpha-numeric and/or audio device is provided at the receiver for outputting information relating to the resource. An indicator is also provided on the cartridge to signal which cartridge is transmitting data at any given time.
    Type: Application
    Filed: February 14, 2001
    Publication date: August 15, 2002
    Inventor: Dennis D. Whitehead