Patents by Inventor R. Dean Lowrey

R. Dean Lowrey 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).

  • Inhibitor removing bath for direct positive color photographic development
    Patent number: 4194911
    Abstract: An inhibitor removing bath for effecting color formation in a color positive development process which bath comprises a color accelerating agent, a contrast control agent and a pH control agent. The inhibitor removing bath may further contain in a preferred embodiment a color reversal agent. A complete color photographic development process using this inhibitor removing bath is found to provide color positive transparencies of excellent quality.
    Type: Grant
    Filed: July 17, 1975
    Date of Patent: March 25, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William A. Huffman, R. Dean Lowrey, Geoffrey C. Nicholson, Bruce Wittnebel
  • Additive for inhibitor removing bath
    Patent number: 4055422
    Abstract: The addition of either a borohydride or borane complex anhydrously associated with an aldose to an inhibitor removing bath which does not contain a color reverse agent improves color balance and contributes color agent to the bath. Addition of these anhydrously associated materials avoids possible decomposition in premixed solutions.
    Type: Grant
    Filed: July 28, 1975
    Date of Patent: October 25, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Bruce W. Wittnebel, R. Dean Lowrey