Patents by Inventor Philip R. Martell

Philip R. Martell 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).

  • Stabilized vinyl sulfone hardening compositions useful in photographic manufacturing
    Patent number: 5514535
    Abstract: Hydrophilic colloids, such as gelatin, which are employed in the manufacture of photographic elements are commonly treated with a hardening composition, among the most useful of which are hardening compositions containing vinyl sulfone hardening agents such as bis(vinylsulfonyl)methane. In accordance with this invention, a sulfate, such as sodium sulfate, is utilized as both an effective conductivity marker and an effective inhibitor of homopolymerization in such hardening compositions.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: May 7, 1996
    Assignee: Eastman Kodak Company
    Inventors: Lewis R. Hamilton, Peter A. Marr, Philip R. Martell, Kristine F. Ohman