Patents by Inventor Lev S. German, deceased

Lev S. German, deceased 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).

  • Bisamidrazone compound and vulcanizing agent for fluorine-containing elastomer comprising the same
    Patent number: 5605973
    Abstract: Novel compound, 2,2-bis(4-carboxyphenyl)hexafluoropropane bisamidrazone, obtained by conversion of the carboxy groups of 2,2-bis(4-carboxyphenyl)hexafluoropropane to acid chloride groups, followed by reaction with ammonia; dehydration reaction of the resulting 2,2-bis(4-carboxyphenyl)hexafluoropropane diamide; reaction of the thus obtained 2,2-bis(4-cyanophenyl)hexafluoropropane with alcohol; and reaction of the resulting 2,2-bis(4-carboxyphenyl)hexafluoropropane bisiminoalkyl ether with hydrazine is a useful vulcanizing agent for fluorine-containing elastomer having cyano group.
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: February 25, 1997
    Assignee: Nippon Mektron, Limited
    Inventors: Yuichi Yamamoto, Satoru Saito, Haruyoshi Tatsu, Lev S. German, deceased, Ziefman Y. Vilovich, Postovoi S. Anatol'evich, Rusanov A. Lvovich
  • Fluoroelastomer and process for producing the same
    Patent number: 5589559
    Abstract: A fluoroelastomer having a copolymer composition comprising 50 to 80% by mole of tetrafluoroethylene, 20 to 45% by mole of perfluoro(lower alkyl vinyl ether) and 0.1 to 2% by mole of perfluoro(allylbenzene), the sum total being 100% by mole, and an intrinsic viscosity of 0.1 to 2.0 dl/g has a good vulcanization rate.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: December 31, 1996
    Assignee: Nippon Mektron, Limited
    Inventors: Satoru Saito, Haruyoshi Tatsu, Lev S. German, deceased