Patents by Inventor William R. MacDonald

William R. MacDonald 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).

  • Roof cover fastener
    Patent number: 10781845
    Abstract: A roof cover fastener may include a cover plate having a planar body with a perimeter. A central aperture may be disposed centrally in the body. A first annular rib may be formed into the body and may encircle the central aperture. A second annular rib may be formed into the body and may encircle the first annular rib. A first channel may separate the first annular rib from the second annular rib. A medial aperture may be disposed in the channel between the first annular rib and the second annular rib. Optionally, the fastener may also include an auger element having a first end and a second end. A head may be coupled to the first end, and a tip may be coupled to the second end. A thread crest with a thread root may extend from the second end towards the first end.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: September 22, 2020
    Assignee: Celcore Incorporated
    Inventors: William R. MacDonald, Peter C. Garrigus, Derek J. Krueger
  • Roof cover fastener
    Patent number: 10190616
    Abstract: A roof cover fastener may include a cover plate having a planar body with a perimeter. A central aperture may be disposed centrally in the body. A first annular rib may be formed into the body and may encircle the central aperture. A second annular rib may be formed into the body and may encircle the first annular rib. A first channel may separate the first annular rib from the second annular rib. A medial aperture may be disposed in the channel between the first annular rib and the second annular rib. The fastener may also include an auger element having a first end and a second end. A head may be coupled to the first end, and a tip may be coupled to the second end. A thread crest with a thread root may extend from the second end towards the first end.
    Type: Grant
    Filed: January 2, 2017
    Date of Patent: January 29, 2019
    Assignee: CELCORE INCORPORATED
    Inventors: William R. MacDonald, Peter C. Garrigus, Derek J. Krueger
  • Housing retention mechanism
    Publication number: 20040239080
    Abstract: The present invention provides an inflatable restraint system that includes a housing having a base plate with a central aperture and a periphery. A folded inflatable restraint cushion is positioned in the housing, as is a gas generator that is operable to supply an inflation gas to the inflatable restraint cushion. The base plate includes a plurality of integral hooked tabs extending from the base plate and having edges formed by a plurality of cuts in the base plate positioned inwardly of the periphery.
    Type: Application
    Filed: May 30, 2003
    Publication date: December 2, 2004
    Inventors: Philip F. Berrahou, Jonathan L. Clarke, William R. Macdonald
  • Air-entraining agent and method of producing same
    Patent number: 5654352
    Abstract: An air-entraining agent for use in cementitious mixtures having fly ash. The air-entraining agent being particularly well suited for use with high carbon or high LOI fly ash.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: August 5, 1997
    Assignee: Maxflow Environmental Corp.
    Inventor: William R. MacDonald
  • Roof cover fastener
    Patent number: D844424
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: April 2, 2019
    Assignee: Celcore Incorporated
    Inventor: William R. MacDonald