Patents by Inventor Terry J. Sonnonstine

Terry J. Sonnonstine 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).

  • Sensitized organic electron donor bis-benzocarbazole compounds
    Patent number: 4367274
    Abstract: Electron donor compounds for use in electrophotographic constructions must be sensitized to desired regions of the electromagnetic spectrum. Novel bis-benzocarbazole derivatives which can be used as organic electron donor compounds have been found to be sensitized by polyquinoid and polyanthroquinoid dyes.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: January 4, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Louis M. Leichter, Terry J. Sonnonstine, John J. Stofko, Jr.
  • Electron bis-benzocarbazole donor compounds and photoconductive charge transport materials
    Patent number: 4361637
    Abstract: Organic electron donor compounds for use in electrophotographic constructions tend to suffer from problems of molecular weight non-uniformity and oxidation. Bis-benzocarbazole derivatives have been found to resist the oxidation and oligomerization which are a source of these problems.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: November 30, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John J. Stofko, Jr., Kenneth G. Kneipp, Terry J. Sonnonstine
  • Fluorinated dye sensitized organic electron donor compound
    Patent number: 4357405
    Abstract: Organic electron donor compounds for use in electrophotographic constructions must ordinarily be sensitized to desired regions of the electromagnetic spectrum. Highly fluorinated aliphatic sulfonyl, carbonyl, or carbonyloxy dyes have been found to be efficient sensitizers for such organic donor compounds.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: November 2, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Louis M. Leichter, John J. Stofko, Jr., Terry J. Sonnonstine
  • Quinoxaline cyanine dye sensitized organic electron donor compounds
    Patent number: 4356244
    Abstract: Organic electron donor compounds for use in electrophotographic constructions must ordinarily be sensitized to desired regions of the electromagnetic spectrum. Imidazo[4,5-b] quinoxaline cyanine dyes having phenylsulfonyl or benzoyl substituents have been found to be efficient sensitizers for such organic donor compounds.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: October 26, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Louis M. Leichter, Terry J. Sonnonstine, John J. Stofko, Jr., Paolo Beretta
  • Electrophotographic plate having charge transport overlayer
    Patent number: 4277551
    Abstract: An electrophotographic plate comprising a conductive substrate, a photoconductive-insulative layer overlaying the substrate and a transparent, electrically active, organic, electron transport layer overlaying the photoconductive-insulative layer in which the photoconductive layer comprises a Se--Te or Se--As mixture in the range of 90-97.5 atomic percent Se or 60-97.5 atomic percent, respectively, and wherein the thicknesses of the photoconductive layer and transport overlayer range between 40 to 100 micrometers and 1 to 5 micrometers, respectively.
    Type: Grant
    Filed: August 20, 1979
    Date of Patent: July 7, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Terry J. Sonnonstine, Kenneth G. Kneipp