Patents by Inventor David J. McCanna

David J. McCanna 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).

  • Compositions comprising polyquaterniums in combination with polymeric biguanides for disinfecting contact lenses
    Patent number: 6153568
    Abstract: The present invention is directed to an ophthalmically safe disinfecting solution for contact lenses comprising the combination of a polymeric biguanide and a polyquaternium polymer of a substituted or unsubstituted vinylimidazole or its vinylimidazoliuum salt, which copolymer has a weight average molecular weight of 5,000 to 5,000,000. The invention is also directed to an improved method of disinfecting a contact lens.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: November 28, 2000
    Inventors: David J. McCanna, Stephen E. Maier, David J. Heiler, Susan P. Spooner, Erning Xia