Patents by Inventor Cecil W. LeFevre

Cecil W. LeFevre 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).

  • Didactic device to aid in understanding and teaching about electromagnetic fields and their effects
    Patent number: 4971562
    Abstract: According to principles of the invention, an educational device is provided for investigating and teaching about electromagnetic fields. The device includes a pair of toroid magnets each having a north pole and a south pole. As is known, a toroid magnet is generally doughnut-shaped with a hole in the middle; one side is north, the other south. The toroid magnets are held together by a magnet support member. The magnets are positioned with their holes aligned to form a common passageway. Like magnetic poles face each other so that the magnets of the pair repel each other. An electrically conductive, metallic, L-shaped rod extends through the common passageway formed by both holes of the pair of toroid magnets. A rod support member is coupled to the base of the rod in a manner to permit the rod to pivot about its base.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: November 20, 1990
    Inventors: Warren J. Gleason, Cecil W. LeFevre
  • Nitrophenylhydrazine compounds
    Patent number: 4374271
    Abstract: N-Amino substituted aniline and 1,3-phenylenediamine compounds having 1 or 2 nitro groups on the aromatic ring. The compounds are useful as herbicides and as intermediates for preparing herbicides.
    Type: Grant
    Filed: April 4, 1979
    Date of Patent: February 15, 1983
    Assignee: United States Borax & Chemical Corporation
    Inventors: Don L. Hunter, William G. Woods, James D. Stone, Cecil W. LeFevre
  • Nitrophenylhydrazine compounds
    Patent number: 4202839
    Abstract: N-Amino substituted aniline and 1,3-phenylenediamine compounds having 1 or 2 nitro groups on the aromatic ring. The compounds are useful as herbicides and as intermediates for preparing herbicides.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: May 13, 1980
    Assignee: United States Borax & Chemical Corporation
    Inventors: Don L. Hunter, William G. Woods, James D. Stone, Cecil W. LeFevre
  • Nitrophenylhydrazine compounds
    Patent number: 4160090
    Abstract: N-Amino substituted aniline and 1,3-phenylenediamine compounds having 1 or 2 nitro groups on the aromatic ring. The compounds are useful as herbicides and as intermediates for preparing herbicides.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: July 3, 1979
    Assignee: United States Borax & Chemical Corporation
    Inventors: Don L. Hunter, William G. Woods, James D. Stone, Cecil W. LeFevre
  • Nitrophenylhydrazine compounds
    Patent number: 4156083
    Abstract: N-Amino substituted aniline and 1,3-phenylenediamine compounds having 1 or 2 nitro groups on the aromatic ring. The compounds are useful as herbicides and as intermediates for preparing herbicides.
    Type: Grant
    Filed: February 12, 1976
    Date of Patent: May 22, 1979
    Assignee: United States Borax & Chemical Corporation
    Inventors: Don L. Hunter, William G. Woods, James D. Stone, Cecil W. LeFevre
  • Nitrophenylhydrazine compounds
    Patent number: 4138244
    Abstract: N-Amino substituted aniline and 1,3-phenylenediamine compounds having 1 or 2 nitro groups on the aromatic ring. The compounds are useful as herbicides and as intermediates for peparing herbicides.
    Type: Grant
    Filed: August 11, 1976
    Date of Patent: February 6, 1979
    Assignee: United States Borax & Chemical Corporation
    Inventors: Don L. Hunter, William G. Woods, James D. Stone, Cecil W. LeFevre
  • 6-Cyano-2,4-dinitro-1,3-phenylenediamines
    Patent number: 3968138
    Abstract: 2,4-Dinitro-1,3-phenylenediamine compounds having a lower alkyl or cyano substituent at the 6-position of the ring are useful as herbicides.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: July 6, 1976
    Assignee: United States Borax & Chemical Corporation
    Inventors: Don L. Hunter, William G. Woods, James D. Stone, Cecil W. LeFevre