Patents by Inventor William J. Hopkins

William J. Hopkins 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).

  • Process and compositions for preserving fresh hides and skins
    Patent number: 4478728
    Abstract: Methods of treating fresh animal hides and skins with compositions containing butyl carbitol and other compounds have been found to preserve the hides and skins.
    Type: Grant
    Filed: October 20, 1983
    Date of Patent: October 23, 1984
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: William J. Hopkins, Paula C. Sweeney, David G. Bailey
  • Process and compositions for preserving fresh hides and skins
    Patent number: 4424059
    Abstract: Methods of treating fresh animal hides and skins with compositions containing butyl carbitol and other compounds have been found to preserve the hides and skins.
    Type: Grant
    Filed: March 10, 1982
    Date of Patent: January 3, 1984
    Assignee: The United States of America as represented by the Secretary of Agriculature
    Inventors: William J. Hopkins, Paula C. Sweeney, David C. Bailey