Patents by Inventor Peter Wuelfing, Jr.

Peter Wuelfing, 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).

  • Method for determining the proper replenishment for a developing solution
    Patent number: 5541027
    Abstract: A method is disclosed in converting silver halide to silver by use of a developer containing two compounds which can be titrated in a single potentiometric titration with silver nitrate and based on the titration an additional quantity of the two compounds are added to depleted developer.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: July 30, 1996
    Assignee: E. I. Du Pont de Nemours and Comapny
    Inventor: Peter Wuelfing, Jr.
  • Stable photographic developer and replenisher therefor
    Patent number: 4741991
    Abstract: An aqueous photographic silver halide developer/replenisher solution particularly useful in low throughput machine processing of X-ray silver halide elements.
    Type: Grant
    Filed: April 14, 1986
    Date of Patent: May 3, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Peter Wuelfing, Jr.