Patents by Inventor Donovan E. Johnson

Donovan E. Johnson 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).

  • Preparing entomocidal products with oligosporogenic mutants of bacillus thuringiensis
    Patent number: 4277564
    Abstract: Six oligosporogenic mutant strains obtained from Bacillus thuringiensis subsp. kurstaki yield parasporal products substantially free of interfering spores when cultivated under normal sporulation conditions. These parasporal products have utility in the biological control of pest insects.
    Type: Grant
    Filed: January 9, 1980
    Date of Patent: July 7, 1981
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventor: Donovan E. Johnson