Patents by Inventor Charles E. Jandrue

Charles E. Jandrue 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).

  • Photographic products and processes
    Patent number: 6103912
    Abstract: A novel class of bridged indicator dyes is disclosed which possess absorption in the infrared region of the electromagnetic spectrum. These bridged indicator dyes are useful as light-absorbing, pH-sensitive optical filter agents in diffusion transfer photographic processes adapted to be performed in the presence of ambient light and to diffusion transfer products useful in such processes. These indicator dyes will also find utility in titrations and other analytical techniques and products where pH-sensitive indicator dyes are employed and absorption of infrared is useful.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: August 15, 2000
    Assignee: Polaroid Corporation
    Inventors: Charles E. Jandrue, Sr., Marcis M. Kampe, Myron S. Simon, David P. Waller, David C. Whritenour
  • Photographic products and processes
    Patent number: 5244771
    Abstract: A novel class of bridged indicator dyes is disclosed which possess absorption in the infrared region of the electromagnetic spectrum. These bridged indicator dyes are useful as light-absorbing, pH-sensitive optical filter agents in diffusion transfer photographic processes adapted to be performed in the presence of ambient light and to diffusion transfer products useful in such processes. These indicator dyes will also find utility in titrations and other analytical techniques and products where pH-sensitive indicator dyes are employed and absorption of infrared is useful.
    Type: Grant
    Filed: August 20, 1991
    Date of Patent: September 14, 1993
    Assignee: Polaroid Corporation
    Inventors: Charles E. Jandrue, Sr., Marcis M. Kampe, Myron S. Simon, David P. Waller, David C. Whritenour
  • Synthesis of benzaldehydes
    Patent number: 4206139
    Abstract: Novel benzaldehydes of the formula: ##STR1## Where n.sup.1 is the integer 1-8 and each OR.sup.1 group is hydroxy or a protective group which can be converted or removed to provide the dihydroxyphenyl moiety.The benzaldehydes are particularly useful as intermediates in the preparation of yellow azomethine dye developers.
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: June 3, 1980
    Assignee: Polaroid Corporation
    Inventors: Elbert M. Idelson, Charles E. Jandrue