Patents by Inventor Roger A. Boggs

Roger A. Boggs 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 compounds
    Patent number: 4946964
    Abstract: There is described a photographic system wherein development of an exposed photosensitive element with an aqueous alkaline photographic developing composition is effected in the presence of a compound represented by the formula ##STR1## wherein R is --OH, --OR.sub.4, --NH.sub.2 --NHR.sub.5 or --NR.sub.4 R.sub.6 ; R.sub.1 is hydrogen, --NH.sub.2, alkyl, substituted alkyl, aryl or substituted aryl; R.sub.2 and R.sub.3 each independently is hydrogen, alkyl, aralkyl or aryl; R.sub.4 is a protecting group which can be removed in the presence of a base; R.sub.5 is an activating group which can render the neighboring hydrogen atom acidic; R.sub.6 is an electron withdrawing group which is capable of stabilizing the negative charge on the nitrogen atom which is produced upon removal of R.sub.4 upon contact with alkali; and PHOTO is a photographically useful group.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: August 7, 1990
    Assignee: Polaroid Corporation
    Inventors: Roger A. Boggs, John B. Mahoney, Avinash C. Mehta, William C. Schwarzel, Lloyd D. Taylor
  • Photographic reagent tetrazoles
    Patent number: 4847383
    Abstract: There are described novel photographic products and processes which utilize compounds which release a photographic reagent in the presence of alkali. The compounds include an imidazole blocking group and cleave in alkali to release the photographic reagent. Also described are novel compounds.
    Type: Grant
    Filed: January 18, 1985
    Date of Patent: July 11, 1989
    Assignee: Polaroid Corporation
    Inventors: James R. Bartels-Keith, Roger A. Boggs, Anthony J. Puttick, Nancy M. Sofen
  • Photographic system utilizing a compound capable of providing controlled release of photographically useful group
    Patent number: 4743533
    Abstract: There is described a photographic system wherein development of an exposed photosensitive element with an aqueous alkaline photographic developing composition is effected in the presence of a compound represented by the formula ##STR1## wherein R is --OH, --OR.sub.4, --NH.sub.2 --NHR.sub.5 or --NR.sub.4 R.sub.6 ; R.sub.1 is hydrogen, --NH.sub.2, alkyl, substituted alkyl, aryl or substituted aryl; R.sub.2 and R.sub.3 each independently is hydrogen, alkyl, aralkyl or aryl; R.sub.4 is a protecting group which can be removed in the presence of a base; R.sub.5 is an activating group which can render the neighboring hydrogen atom acidic; R.sub.6 is an electron withdrawing group which is capable of stabilizing the negative charge on the nitrogen atom which is produced upon removal of R.sub.4 upon contact with alkali; and PHOTO is a photographically useful group.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: May 10, 1988
    Assignee: Polaroid Corporation
    Inventors: Roger A. Boggs, John B. Mahoney, Avinash C. Mehta, William C. Schwarzel, Lloyd D. Taylor
  • Photographic products and processes and novel compounds
    Patent number: 4503139
    Abstract: There are described novel photographic products and processes which utilize compounds which release a photographic reagent in the presence of alkali. The compounds include an imidazole blocking group and cleave in alkali to release the photographic reagent. Also described are novel compounds.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: March 5, 1985
    Assignee: Polaroid Corporation
    Inventors: James R. Bartels-Keith, Roger A. Boggs, Anthony J. Puttick, Nancy M. Sofen