Patents by Inventor David R. Hurst

David R. Hurst 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: 20010025557
    Abstract: A compound punching apparatus for providing a substrate having half of the perforations formed from one major surface of the substrate and the other half of the perforations formed from the opposite major surface. The arrangement of the punches create equal and opposite stress forces in the substrate that essentially cancel each other out to provide a product meeting exacting planarity requirements. The compound punching apparatus includes two diametrically opposed dies and punching tools, a feed system, a drive system and a frame.
    Type: Application
    Filed: June 7, 2001
    Publication date: October 4, 2001
    Inventors: Carlton G. Jenkins, David R. Hurst
  • Patent number: 5842398
    Abstract: A perforated substrate having half of the perforations formed from one major surface of the substrate and the other half formed from the opposite major surface, the two major surface being coplanar is described. This introduces equal and opposite stress forces into the substrate which essentially cancel each other and provide a product meeting exacting planarity requirements.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: December 1, 1998
    Assignee: Precious Plate Florida
    Inventors: Carlton G. Jenkins, David R. Hurst
  • Patent number: 5578398
    Abstract: A perforated substrate having half of the perforations formed from one major surface of the substrate and the other half formed from the opposite major surface, the two major surface being coplanar is described. This introduces equal and opposite stress forces into the substrate which essentially cancel each other and provide a product meeting exacting planarity requirements.
    Type: Grant
    Filed: December 13, 1995
    Date of Patent: November 26, 1996
    Assignee: Precious Plate Florida
    Inventors: Carlton G. Jenkins, David R. Hurst
  • Patent number: 4530949
    Abstract: A housing for electrical or electronic equipment is made by moulding under heat a composition comprising an organic thermosetting resin which includes exfoliated graphite in an amount which is enough to impart to the moulded article an electrical resistivity not greater than 10 ohm-cm.The housing has an excellent capacity to reduce the level of electromagnetic radiation emitted by equipment within it and to shield electronic equipment from external electromagnetic radiation.
    Type: Grant
    Filed: July 19, 1984
    Date of Patent: July 23, 1985
    Assignee: T&N Materials Research Limited
    Inventors: Alan W. Atkinson, David R. Hurst, Kenneth T. Somerfield
  • Patent number: 4343765
    Abstract: In a first embodiment of the method and apparatus, the oxidant is loaded upon a support bed and is continuously regenerated by an ozone generator located upstream from the support bed. The ozone generator has a capacity less than the peak load requirement for the oxidant but fully regenerates the oxidant during low load periods. An ozone detector is located downstream from the support bed and includes a control circuit for selectively deactivating the ozone generator when the ozone downstream from the support bed exceeds a predetermined level. The support bed is composed of inert or adsorbing granular material. In a second embodiment, an aqueous solution containing a water soluble oxidant is applied to the support bed and is rinsed out following a purification cycle. The rinsed oxidant is replaced by fresh oxidant from a reservoir and the rinsed, spent oxidant is regenerated in an electrolytic or chemical regenerator and returned to the oxidant reservoir.
    Type: Grant
    Filed: December 11, 1980
    Date of Patent: August 10, 1982
    Assignee: Georgia Tech Research Institute
    Inventors: Lewis W. Elston, David R. Hurst
  • Patent number: 4278450
    Abstract: A method and apparatus for stripping entrained organic vapor and solid particulate matter from a pyrolytic off-gas stream is disclosed. The off-gas is introduced at the top of a conical chamber having a variable speed "squirrel cage" rotor at its top. The wet, dirty, off-gas is drawn into the rotor from below and impinged upon the chamber walls which causes part of the organic vapor to condense and flow to the chamber bottom, thereby cleaning the chamber walls. A portion of the impinged gas is recirculated through the rotor while the remainder exits at the chamber bottom. The ratio of recycled gas to through gas is controlled by the speed of the rotor. Heating and cooling coils on the chamber walls are operable to control the rate of condensation.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: July 14, 1981
    Assignee: Georgia Tech Research Institute
    Inventors: David R. Hurst, Lewis W. Elston