Patents by Inventor David J. Wheeler

David J. Wheeler 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).

  • Publication number: 20190138466
    Abstract: In at least some examples, a computing node includes a processor and a local memory coupled to the processor. The computing node also includes a reflective memory bridge coupled to the processor. The reflective memory bridge maps to an incoming region of the local memory assigned to at least one external computing node and maps to an outgoing region of the local memory assigned to at least one external computing node.
    Type: Application
    Filed: January 25, 2018
    Publication date: May 9, 2019
    Inventors: Blaine D GAITHER, Robert J BROOKS, Benjamin D OSECKY, Kathryn A EVERTSON, Andrew R WHEELER, David Fisk
  • Patent number: 6194833
    Abstract: A microdischarge device having a gas or vapor contained in a microcavity and in electrical contact with a semiconductor substrate, preferably a silicon wafer. A preferred structure includes successive cathode substrate or film, dielectric, and conductive anode layers with the anode and dielectric layers penetrated by a plurality of microcavities to allow electrical contact between the discharge medium and the substrate cathode layer. A hollow cathode structure includes a microcavity that penetrates the cathode. An optical waveguide network may be used in addition to collect and concentrate emission from groups of individual microcavities. The small aperture of the cavity area, of about 1 to 400 micrometers in diameter, enable the electrons in the discharge to be ballistic under certain conditions and permit the gas pressure to exceed one atmosphere. In addition, the small dimensions permit resonance radiation, such as the 254 nm line of atomic mercury, to be extracted efficiently from the discharge volume.
    Type: Grant
    Filed: October 22, 1998
    Date of Patent: February 27, 2001
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Thomas A. DeTemple, James Frame, David J. Wheeler, J. Gary Eden
  • Patent number: 6139384
    Abstract: A microdischarge lamp formed in a one piece integral substrate, preferably a silicon wafer, via micromachining techniques commonly used in integrated circuit manufacture. The lamp is formed by defining an anode separated from a semiconductor cathode, and then micromachining a hollow cavity penetrating the anode, dielectric and cathode. The hollow cathode is formed in the semiconductor and is filled with a discharge medium and sealed to complete the formation process. The lamp includes a micromachined cavity area for enclosing discharge filler, such as mercury vapor. The one piece substrate includes one or more semiconductor regions which act as electrodes for the lamp. A light transmissive cap seals the cavity area. Selection of particular aperture to length ratios for the cavity area permits the lamp to be operated either as a positive column or hollow cathode discharge. Hollow cathode discharge has been demonstrated at pressures of up to about 200 Torr.
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: October 31, 2000
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Thomas A. DeTemple, James Frame, David J. Wheeler, J. Gary Eden
  • Patent number: 6016027
    Abstract: A microdischarge lamp formed in a one piece integral substrate, preferably a silicon wafer, via micromachining techniques commonly used in integrated circuit manufacture. The lamp includes a micromachined cavity area for enclosing discharge filler, such as mercury vapor. The one piece substrate includes one or more semiconductor regions which act as electrodes for the lamp. A light transmissive cap seals the cavity area. Selection of particular aperture to length ratios for the cavity area permits the lamp to be operated either as a positive column or hollow cathode discharge. Hollow cathode discharge has been demonstrated at pressures of up to about 200 Torr. The small aperture of the cavity area, of about 1 to 400 micrometers, enable the electrons in the discharge to be ballistic. In addition, the small dimensions permit discharges based upon resonance radiation, such as the 253 nm line of atomic mercury.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: January 18, 2000
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Thomas A. DeTemple, James Frame, David J. Wheeler, J. Gary Eden
  • Patent number: 5493283
    Abstract: A system for locating any mobile body of a plurality thereof within a predetermined environment, wherein each mobile body carries a transmitter (10 to 18), each transmitter producing a unique identifying signal, and a plurality of receivers (20 to 32) located in a corresponding plurality of defined regions in the environment, each receiver incorporating a FIFO buffer memory (28) into which carrier identifying data is inserted and a controller for interrogating the receiver means in turn to link the identification data with location data. (FIG. 1 ). A carrier authentication system is also described.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: February 20, 1996
    Assignee: Olivetti Research Limited
    Inventors: Andrew Hopper, Roy Want, Roger M. Needham, David J. Wheeler
  • Patent number: 5402469
    Abstract: A system for locating any mobile body or a plurality thereof within a predetermined environment, wherein each mobile body carries a transmitter (10 to 18), each transmitter producing a unique identifying signal, and a plurality of receivers (20 to 32) located in a corresponding plurality of defined regions in the environment, each receiver incorporating a FIFO buffer memory (28) into which carrier identifying data is inserted and a controller for interrogating the receiver means in turn to link the identification data with location data.
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: March 28, 1995
    Assignee: Olivetti Research Limited
    Inventors: Andrew Hopper, Roy Want, Roger M. Needham, David J. Wheeler
  • Patent number: 4128201
    Abstract: Synchronizing means is provided for synchronizing with a periodically repeating reference signal the change of level of an input signal which is capable of assuming either one of a first and second level. A bistable device is enabled periodically by the reference signal to respond to the input signal and assume either one of its two stable states in correspondence with the first or second level of input signal and produce an output signal which has either one of two different levels according to the stable state assumed. Means is provided to respond to the output signal when it has a value intermediate the two levels to generate a stop signal which indicates that the bistable device is in a metastable condition and which is used to interrupt the reference signal at a predetermined point in its periodicity before the bistable device is next enabled and until the bistable device assumes a stable condition.
    Type: Grant
    Filed: September 21, 1976
    Date of Patent: December 5, 1978
    Assignee: Computer Technology Limited
    Inventors: Iann M. Barron, David J. Wheeler