Patents by Inventor George H. Butterfield, Jr.

George H. Butterfield, Jr. 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).

  • Composition for hard type contact lens with wettable surface
    Patent number: 3948871
    Abstract: A contact lens of the hard type, but exhibiting wettable surface characteristics, is produced from a polymer composition consisting essentially of about 90% by weight methyl methacrylate and about 10% by weight of neutralized hydroxy ethyl methacrylate.
    Type: Grant
    Filed: February 4, 1974
    Date of Patent: April 6, 1976
    Assignee: George H. Butterfield and Son
    Inventors: George H. Butterfield, Jr., George H. Butterfield, Sr., deceased, by David Gordon, executor