Patents by Inventor Kelvin Kei-Wei Shen

Kelvin Kei-Wei Shen 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).

  • Morpholinobenzimidazole N-oxides
    Patent number: 4094662
    Abstract: Tricyclic 1,2-morpholinobenzimidazole N-oxides having a trifluoromethyl or branched-chain alkyl group on the aromatic ring para to the morpholino nitrogen. The compounds are herbicidal and can be used as intermediates for preparing herbicidal compounds.
    Type: Grant
    Filed: March 10, 1977
    Date of Patent: June 13, 1978
    Assignee: United States Borax & Chemical Corporation
    Inventors: Kelvin Kei-Wei Shen, Wayne Stuart Belles
  • Quadricyclic morpholinobenzimidazole compounds
    Patent number: 4094663
    Abstract: Quadricyclic morpholinobenzimidazole compound having a trimethylene group on the aromatic ring and the N-oxide derivative thereof. The compounds are useful as herbicides.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: June 13, 1978
    Assignee: United States Borax & Chemical Corporation
    Inventor: Kelvin Kei-Wei Shen
  • Herbicidal morpholinobenzimidazoles
    Patent number: 4049422
    Abstract: Tricyclic 1,2-morpholinobenzimidazoles having a haloalkyl, alkylsulfonyl, haloalkylsulfonyl, halo or lower alkyl substituent on the aromatic ring para to the morpholino nitrogen. The aromatic ring and morpholino ring may also have other substituents. The compounds are herbicidal, useful as pre-emergence or post-emergence treatments.
    Type: Grant
    Filed: March 29, 1976
    Date of Patent: September 20, 1977
    Assignee: United States Borax & Chemical Corporation
    Inventors: Kelvin Kei-Wei Shen, Wayne Stuart Belles
  • 2-Dialkylamino-5-trifluoromethyl-7-nitrobenzimidazoles
    Patent number: 3954792
    Abstract: Benzimidazoles of the formula ##SPC1##Wherein R.sub.1 represents hydrogen or an alkyl group which may optionally be substituted, R.sub.2 represents lower alkyl, and X is hydrogen, lower alkoxy or halo. The compounds are useful as intermediates for preparation of herbicides.
    Type: Grant
    Filed: March 6, 1975
    Date of Patent: May 4, 1976
    Assignee: United States Borax & Chemical Corporation
    Inventor: Kelvin Kei-Wei Shen