Patents by Inventor Paul D. Hillman

Paul D. Hillman 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: 7035297
    Abstract: 1064-nm and 1319-nm light respectively generated by two lasers is combined and injected into a doubly resonant sum-frequency generator. The optical path length of the sum-frequency generator is adjusted responsive to feedback of the 1319-nm light to maintain 1319-nm resonance. Feedback of 1064-nm light is concurrently used to adjust the 1064-nm laser responsive to the optical path length to maintain 1064-nm resonance. Light output from the sum-frequency generator is compared to the sodium D2a wavelength i.e., approximately 589 nm, and the 1319-nm laser is responsively adjusted to eliminate any differential. This abstract is provided to comply with the rules requiring an abstract, and is intended to allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: April 25, 2006
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Craig A. Denman, Paul D. Hillman, Gerald T. Moore, John M. Telle, Brent W. Grime, Joshua C. Bienfang
  • Patent number: 7028679
    Abstract: Prior art air charge systems for ‘V’ configuration internal combustion engines use two turbochargers and two intercoolers, one for each bank of cylinders, and require relatively long and complex air ducts. The present invention provides a charge air system for a ‘V’ engine with two banks of cylinders. The system includes a compressor connected by a charge air conduit to a charge air cooler and a flow control valve in communication with first and second branch conduits, each adapted for connection to a bank of cylinders. A branch connector has one inlet in communication with the valve and two outlets in communication with the two branch conduits. The charge air conduit may be disposed in the ‘V’ between the two banks of cylinders. The system uses one compressor and one cooler, thereby reducing component and assembly costs for the engine and keeping air ducting relatively simple.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: April 18, 2006
    Assignee: Caterpillar Inc.
    Inventors: Paul D. Hillman, Stephen P. Middleton
  • Publication number: 20040079346
    Abstract: Prior art air charge systems for ‘V’ configuration internal combustion engines use two turbochargers and two intercoolers, one for each bank of cylinders, and require relatively long and complex air ducts. The present invention provides a charge air system for a ‘V’ engine with two banks of cylinders. The system includes a compressor connected by a charge air conduit to a charge air cooler and a flow control valve in communication with first and second branch conduits, each adapted for connection to a bank of cylinders. A branch connector has one inlet in communication with the valve and two outlets in communication with the two branch conduits. The charge air conduit may be disposed in the ‘V’ between the two banks of cylinders. The system uses one compressor and one cooler, thereby reducing component and assembly costs for the engine and keeping air ducting relatively simple.
    Type: Application
    Filed: October 17, 2003
    Publication date: April 29, 2004
    Inventors: Paul D. Hillman, Stephen P. Middleton
  • Patent number: 4666417
    Abstract: An amusement device is described which comprises an elongated, flexible, tubular sheath having two ends. A shape-forming core member is contained within the sheath and extends through substantially the length of the sheath. An end cap is secured to each end of the sheath. The amusement device may be shaped into any desired shape or configuration and it will retain that shape until the user desires to change the shape.
    Type: Grant
    Filed: October 21, 1985
    Date of Patent: May 19, 1987
    Inventor: Paul D. Hillman
  • Patent number: D600522
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: September 22, 2009
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Paul D. Hillman