Patents by Inventor Lev Solomonovich German, deceased

Lev Solomonovich 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).

  • Bisaminothiophenol compound
    Patent number: 5831127
    Abstract: A novel bisaminothiophenol compound represented by the following general formula: ##STR1## where Rf is a perfluoroalkylidene group having 1 to 10 carbon atoms, is used as a cross-linking agent for fluorine-containing elastomers having CN groups as cross-linkable groups.
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: November 3, 1998
    Assignee: Nippon Mektron Limited
    Inventors: Satoru Saito, Haruyoshi Tatsu, Lev Solomonovich German, deceased, Valerii Romanovich Polishchuk, deceased
  • Process for preparing 2,2-diphenylhexafluoropropanes
    Patent number: 5763699
    Abstract: 2,2-diphenylhexafluoropropanes are prepared by condensation reaction of benzene or benzenes substituted with a halogen atom or atoms, a lower alkyl group or groups or a hydroxyl group or groups with hexafluoroacetone in the presence of trifluoromethane sulfonic acid. Among the 2,2-diphenylhexafluoropropanes, 2,2-diphenylhexafluoropropane and 2,2-bis(p-chlorophenyl)hexafluoropropane are novel compounds.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: June 9, 1998
    Assignee: Nippon Mektron, Limited
    Inventors: Lev Solomonovich German, deceased, Valerii Romanovich Polishchuk, deceased, Riichi Iwa, Haruyoshi Tatsu
  • Bisaminothiophenol compound, process for producing the same and curing agent for fluorine-containing elastomer comprising the same
    Patent number: 5688872
    Abstract: 2,2-bis(4-aminophenyl)hexafluoropropane is allowed to react with potassium thiocyanate and bromine to obtain 2,2-bis(5-amino-4,6-benzothiazolyl)hexafluoropropaneo which is allowed to further react successively with potassium hydroxide and hydrochloric acid to obtain 2,2-bis(4-amino-3-mercapto-phenyl)hexafluoropropane, which is a novel compound applicable as a curing agent for a fluorine-containing elastomer having CN groups as cross-linkable groups.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: November 18, 1997
    Assignee: Nippon Mektron, Limited
    Inventors: Takehiro Sonoi, Haruyoshi Tatsu, Lev Solomonovich German, deceased, Valerii Romanovich Polishchuk, deceased
  • Bisaminothiophenol compound, process for producing the same and curing agent for fluorine-containing elastomer comprising the same
    Patent number: 5672758
    Abstract: 2,2-bis(4-aminophenyl)hexafluoropropane is allowed to react with potassium thiocyanate and bromine to obtain 2,2-bis (5-amino-4,6-benzothiazolyl)hexafluoropropane, which is allowed to further react successively with potassium hydroxide and hydrochloric acid to obtain 2,2-bis(4-amino-3-mercaptophenyl)hexafluoropropane, which is a novel compound applicable as a curing agent for a fluorine-containing elastomer having CN groups as cross-linkable groups.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: September 30, 1997
    Assignee: Nippon Mektron, Limited
    Inventors: Takehiro Sonoi, Haruyoshi Tatsu, Lev Solomonovich German, deceased, Valerii Romanovich Polishchuk, deceased