Patents by Inventor Richard W. Rentfrow

Richard W. Rentfrow 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).

  • Degradable practice mine
    Patent number: 6539871
    Abstract: A method for making a degradable practice mine including the steps of covering a flat work surface with a polyethylene sheet to serve as a release film, weighing out the materials in a ratio of 10 parts sand to 1 part polyvinyl alcohol (PVA), mixing 1 part PVA with 10 parts sand making a sand/PVA mixture, filling a mold with the sand/PVA mixture, consolidating the sand/PVA mixture to make a consolidated form in the shape of a mine, and heating the consolidated form to make a hardened mine form mimicking the shape and launching characteristics of a tactical mine.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: April 1, 2003
    Assignee: Alliant Techsystems Inc.
    Inventors: Scott A. Englar, Richard W. Rentfrow, Wesley G. Marquette, Robert E. Long
  • Degradable practice mine
    Publication number: 20020178958
    Abstract: A method for making a degradable practice mine including the steps of covering a flat work surface with a polyethylene sheet to serve as a release film, weighing out the materials in a ratio of 10 parts sand to 1 part polyvinyl alcohol (PVA), mixing 1 part PVA with 10 parts sand making a sand/PVA mixture, filling a mold with the sand/PVA mixture, consolidating the sand/PVA mixture to make a consolidated form in the shape of a mine, and heating the consolidated form to make a hardened mine form mimicking the shape and launching characteristics of a tactical mine.
    Type: Application
    Filed: March 29, 2001
    Publication date: December 5, 2002
    Inventors: Scott A. Englar, Richard W. Rentfrow, Wesley G. Marquette, Robert E. Long
  • Mass-spring rainhead
    Patent number: 4471698
    Abstract: Apparatus for rendering the fusing of a ballistic missile, including a firing pin, insensitive to raindrop impact, by interposing between the firing pin and the site of impact of raindrops, a resonant mechanical system having a natural period which is long compared to the duration of impact of any raindrop.
    Type: Grant
    Filed: February 25, 1982
    Date of Patent: September 18, 1984
    Assignee: Honeywell Inc.
    Inventors: Richard W. Rentfrow, Edwin M. Stryker