Patents by Inventor David L. Krohn

David L. Krohn 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).

  • Ophthalmic formulation
    Patent number: 4003991
    Abstract: An ophthalmic "ointment" comprising water, a solid water-soluble polymer of controlled molecular weight, and a medicament or therapeutic agent such as pilocarpine in its pharmacologically acceptable salts.
    Type: Grant
    Filed: August 27, 1974
    Date of Patent: January 18, 1977
    Assignee: National Patent Development Corporation
    Inventors: David L. Krohn, Samuel H. Ronel