Patents by Inventor Lapyuen H. Lam

Lapyuen H. Lam 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).

  • Preparation of 4-deoxy-O-mycaminosyltylonolide
    Patent number: 5698420
    Abstract: Preparation of 4'-deoxy-O-mycaminosyltylonolide by feeding repromicin to a fermentation broth of a strain of the microorganism Streptomyces fradiae (ATCC 31733) under aerobic conditions in an aqueous nutrient medium containing inorganic salts and assimilable sources of carbon and nitrogen.
    Type: Grant
    Filed: November 26, 1996
    Date of Patent: December 16, 1997
    Assignee: Pfizer Inc.
    Inventor: Lapyuen H. Lam
  • Cultures for production of avermectin aglycones
    Patent number: 5583029
    Abstract: Mutants of Streptomyces avermitilis lacking ability to produce glycosylated avermectins and lacking branched-chain 2-oxo acid dehydrogenase activity, method for preparation thereof, and use thereof to produce natural and non-natural avermectin aglycones useful as parasiticides.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: December 10, 1996
    Assignee: Pfizer Inc.
    Inventors: Lapyuen H. Lam, Hamish A. I. McArthur, Richard G. Wax
  • Cultures for production of avermectin aglycones
    Patent number: 5240850
    Abstract: Mutants of Streptomyces avermitilis lacking ability to produce glycosylated avermectins and lacking branched-chain 2-oxo acid dehydrogenase activity, method for preparation thereof, and use thereof to produce natural and non-natural avermectin aglycones useful as parasiticides.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: August 31, 1993
    Assignee: Pfizer Inc.
    Inventors: Lapyuen H. Lam, Hamish A. I. McArthur, Richard G. Wax