Patents by Inventor David A. Stivers

David A. Stivers 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).

  • Rotating guard for angle grinder
    Patent number: 6893334
    Abstract: A guard for a rotary cutting tool allows for automatic adjustment of the guard relative to the cutting disc and to a workpiece. Such an automatic adjustment allows a user to cut around substantially the entire circumference of a rounded workpiece, such as a pipe, without requiring alteration of the angle at which the tool is held, repositioning by the user, or repositioning or removal of the guard. The guard includes a bracket for mounting the guard to the rotary cutting tool, a hood mounted to the bracket and enclosing a portion of the cutting disc, and a spring for biasing one end of the hood into substantially continuous contact with the workpiece during operation of the rotary cutting tool.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: May 17, 2005
    Inventor: J. David Stivers
  • Curing fluorocarbon elastomers
    Patent number: 5384374
    Abstract: Fluorocarbon elastomer gum is compounded with fluorinated ether compositions, the resulting compounded gum is shaped and heated to form a cured shaped article such as automotive fuel line hose or O-ring.
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: January 24, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Miguel A. Guerra, David A. Stivers
  • Curing fluorocarbon elastomers
    Patent number: 5266650
    Abstract: Fluorocarbon elastomer gum is compounded with fluorinated ether compositions, the resulting compounded gum is shaped and heated to form a cured shaped article such as automotive fuel line hose or O-ring.
    Type: Grant
    Filed: October 11, 1909
    Date of Patent: November 30, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Miguel A. Guerra, David A. Stivers
  • Processing elastomers
    Patent number: 4595720
    Abstract: The processing of elastomer gums, which can be natural rubber or synthetic elastomers such as copolymers of vinylidene fluoride and hexafluoropropylene, are improved by incorporating in said gum, along with conventional chemical and compounding ingredients, cyanuric acid or isocyanurate or cyanurate derivatives thereof to improve the processing of such gums, for example, to improve the extrudability thereof or the release of molded articles thereof from the mold.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: June 17, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: David A. Stivers, Richard A. Guenthner
  • Vulcanizing fluorocarbon elastomers with one or a mixture of aromatic compounds having hydroxyl and oxyallyl groups
    Patent number: 4446270
    Abstract: A composition comprising elastomeric copolymer gum of vinylidene fluoride and at least one terminally unsaturated monolefin comonomer and as a vulcanizing agent therefor a composition comprising one or a mixture of aromatic compounds having hydroxyl and oxyallyl groups directly bonded to aromatic ring-carbon atoms.
    Type: Grant
    Filed: August 8, 1983
    Date of Patent: May 1, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard A. Guenthner, David A. Stivers
  • Fluoroelastomer/polyepichlorohydrin elastomer articles
    Patent number: 4343861
    Abstract: A gum stock composition comprising fluoropolymer gum, polyepichlorohydrin gum, polyphenol, and organo-onium compound is mixed with acid acceptor to form a curable gum stock, and the latter is shaped and cured to form shaped elastomeric articles.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: August 10, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: David A. Stivers
  • Fluoroelastomer/polyepichlorohydrin elastomer articles
    Patent number: 4293663
    Abstract: A gum stock composition comprising fluoropolymer gum, polyepichlorohydrin gum, polyphenol, and organo-onium compound is mixed with acid acceptor to form a curable gum stock, and the latter is shaped and cured to form shaped elastomeric articles.
    Type: Grant
    Filed: October 23, 1979
    Date of Patent: October 6, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: David A. Stivers