Patents by Inventor Harry D. Crandon

Harry D. Crandon 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).

  • Abrasion-resistant optical element
    Patent number: 4120992
    Abstract: An abrasion-resistant organic optical element comprising a transparent base of a synthetic organic material having an adhering coating of an abrasion-resistant material comprising a polysilicic acid ester of an alcohol containing from 1 to 12 carbon atoms and a partially hydrolyzed vinyl polymer to provide polyvinyl alcohol, the coating being cross-linked with formaldehyde or zirconyl nitrate or mixtures thereof. The abrasion-resistant organic optical elements can comprise sheet material or a lens.
    Type: Grant
    Filed: June 23, 1977
    Date of Patent: October 17, 1978
    Assignee: American Optical Corporation
    Inventors: Bernard L. Laurin, Don H. Rotenberg, Harry D. Crandon
  • Abrasion-resistant optical element
    Patent number: 4049868
    Abstract: An abrasion-resistant organic optical element comprising a transparent base of a synthetic organic material having an adhering coating of an abrasion-resistant material comprising a polysilicic acid ester of an alcohol containing from 1 to 12 carbon atoms and a partially hydrolyzed vinyl polymer to provide polyvinyl alcohol; the coating being cross-linked with formaldehyde or zirconyl nitrate or mixtures thereof. The abrasion-resistant organic optical elements can comprise sheet material or a lens.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: September 20, 1977
    Assignee: American Optical Corporation
    Inventors: Bernard L. Laurin, Don H. Rotenberg, Harry D. Crandon