Patents by Inventor Ronald B. Yamasaki

Ronald B. Yamasaki 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).

  • Azadirachtin derivative insecticides
    Patent number: 5047242
    Abstract: Derivatives of azadirachtin are described which should facilitate their synthesis and provide greater stability than their naturally-occurring counterpart. The derivative 2',3',22,23-tetrahydorazadirachtin is also described, that derivative retaining full activity and having enhanced stability. Also described is a newly identified, naturally occurring derivative of azadirachtin, 1-cinnamoylmelianolone, and several of its derivatives. Insecticidal and antifeedant compositions including these compounds, and processes for their use, are also described.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: September 10, 1991
    Assignee: Native Plant Institute ("NPI")
    Inventors: James A. Klocke, S. Mark Lee, Ronald B. Yamasaki
  • Azadirachtin derivative insecticides
    Patent number: 5001149
    Abstract: Derivatives of azadirachtin are described which should facilitate their synthesis and provide greater stability than their naturally-occurring counterpart. The derivative 2',3',22,-23-tetraydroanzadirachtin is also described, that derivative retaining full activity and having enhanced stability. Insecticidal and antifeedant compositions including these compounds also described.
    Type: Grant
    Filed: March 4, 1987
    Date of Patent: March 19, 1991
    Assignee: NPI
    Inventors: James A. Klocke, Ronald B. Yamasaki
  • Salannin derivative insect control agents
    Patent number: 4960791
    Abstract: Derivatives of salannin, including 2',3',20,21,22,23-hexahydro salannin and 20,21,22,23-tetrahydro salannin derivatives, having up to 40-fold greater insect antifeedant activity than native salannin.
    Type: Grant
    Filed: December 16, 1988
    Date of Patent: October 2, 1990
    Assignee: NPI
    Inventors: James A. Klocke, Ronald B. Yamasaki