Patents by Inventor Hugh C. Richards

Hugh C. Richards 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).

  • Pesticidal carbamates
    Patent number: 4016278
    Abstract: Novel (heterocyclicthio)phenyl N-alkylcarbamates, (heterocyclicthio)phenyl N-acyl-N-alkylcarbamates and their thionocarbamate analogs. The compounds are pesticidal agents, which are particularly suitable as ectoparasiticidal agents for use in sheep, cattle, horses, swine and the like.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: April 5, 1977
    Assignee: Pfizer Inc.
    Inventors: Richard C. Koch, Hugh C. Richards
  • Control of rice blast disease employing certain pyrido compounds
    Patent number: 4008325
    Abstract: A method of treatment or control of diseases of rice plants comprising contacting the plants, and the seeds thereof with an effective amount of a compound of the formula: ##STR1## or a non-phytotoxic acid addition salt thereof, wherein each of X and Y completes a saturated or unsaturated pyrrolo- or pyrido-ring;X and Y may each be substituted with up to two substituents selected from halo, lower alkyl, phenyl, oxo or thio;And R is hydrogen, lower akyl, lower alkoxy, lower alkanoyl, benzoyl, hydroxy, lower alkanoyloxy, cyano, or halo; andZ is hydrogen or halo.Certain of these compounds are novel compounds and are claimed as such. Compositions for the treatment of plant diseases are also claimed.
    Type: Grant
    Filed: July 25, 1975
    Date of Patent: February 15, 1977
    Assignee: Pfizer Inc.
    Inventors: Robert J. Bass, Richard C. Koch, Hugh C. Richards, John E. Thorpe