Patents by Inventor Robert H. Krahnke

Robert H. Krahnke 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).

  • Patent number: 5948854
    Abstract: Alkoxy-functional room temperature vulcanizing (RTV) compositions, curable in the presence of moisture, comprising polymers containing on average at least 1.2 alkoxysilyl chain terminations per molecule, a tetraalkoxytitanium compound containing on average greater than 90 mole percent of the alkoxy groups as tertiary amyloxy groups, a filler, and an alkoxysilane. The addition of these components in amounts to satisfy defined molar ratios provide alkoxy-functional RTV compositions having both improved storage stability and improved green strength upon curing.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: September 7, 1999
    Assignees: Dow Corning S.A., Dow Corning Corporation
    Inventors: Francois de Buyl, Robert H. Krahnke, Timothy B. Lueder, Richard A. Palmer
  • Patent number: 5545704
    Abstract: A method is described of producing alkoxysilalkylene enblocked polydiorganosiloxane in two steps. First, silanol terminated polydiorganosiloxane is capped with an SiH containing silazane in the presence of an acid catalyst. Then, that polymer is reacted with an alkoxy functional alkenylsilane in the presence of a hydrosilylation catalyst to give the desired polymer. The polymers are useful in formulating room temperature curing sealants.
    Type: Grant
    Filed: July 24, 1995
    Date of Patent: August 13, 1996
    Assignee: Dow Corning Corporation
    Inventors: Tara N. Estes, Robert H. Krahnke
  • Patent number: 5470923
    Abstract: Silicone pressure sensitive adhesive compositions which cure in the presence of moisture comprise an adhesive component which bears alkoxy radical-containing curing radicals and, optionally, a catalyst to accelerate the reaction of moisture with the alkoxy radicals to form siloxane bonds. Curing provides adhesives ranging from pressure sensitive adhesives having improved properties to permanent adhesives. The adhesives are useful for adhering an object to a surface and thereafter improving the bond between the object and the surface by exposure to moisture.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: November 28, 1995
    Assignee: Dow Corning Corporation
    Inventors: Robert H. Krahnke, Shawn K. Mealey, William J. Schoenherr, Schuyler B. Smith, deceased, Thomas J. Tangney
  • Patent number: 5210156
    Abstract: Silicone pressure sensitive adhesive compositions which cure in the presence of moisture comprise an adhesive component which bears alkoxy radical-containing curing radicals, a catalyst to accelerate the reaction of moisture with the alkoxy radicals to form siloxane bonds and a multialkoxy silicon compound to stabilize the composition in the solventless state. Curing provides adhesives ranging from pressure sensitive adhesives having improved properties to permanent adhesives. The adhesives are useful for adhering an object to a surface and thereafter improving the bond between the object and the surface by exposure to moisture.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: May 11, 1993
    Assignee: Dow Corning Corporation
    Inventors: Joseph N. Clark, Robert H. Krahnke, Shawn K. Mealey, William J. Schoenherr
  • Patent number: 5208300
    Abstract: Silicone pressure sensitive adhesive compositions which are stable in the absence of moisture but which cure in the presence of moisture comprise an adhesive component which bears alkoxy radical-containing curing radicals and, optionally, a catalyst to accelerate the reaction of moisture with the alkoxy radicals to form siloxane bonds. Curing provides adhesives ranging from pressure sensitive adhesives having improved properties to permanent adhesives. The adhesives are useful for adhering an object to a surface and thereafter improving the bond between the object and the surface by exposure to moisture.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: May 4, 1993
    Assignee: Dow Corning Corporation
    Inventors: Robert H. Krahnke, Shawn K. Mealey, William J. Schoenherr
  • Patent number: 5017672
    Abstract: A polyalkoxysilylalkylenedisilazane of the formula ##STR1## and a polyalkoxysilylalkylenesilylamine of the formula ##STR2## where x is 0 or 1; R is a saturated alkyl or aryl radical or mixture of radicals; R' is alkyl, aryl, or Cellosolve (R) alkylethanol radical, or mixture of radicals; R" is hydrogen, alkyl, aryl, or aryalkyl radial or mixture of radicals; and A is a divalent hydrocarbon radical having 2 to 20 carbon atoms; and a method for their manufacture by the platinum catalyzed addition of an alkenyl- functional disilazane or silylamine with an alkoxy-functional silicon hydride is disclosed. The silylamine can also be produced by the platinum catalyzed addition of a SiH functional silazane or silylamine and an alkenyltrialkoxysilane.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: May 21, 1991
    Assignee: Dow Corning Corporation
    Inventors: Robert H. Krahnke, John C. Saam
  • Patent number: 4847400
    Abstract: A polyalkoxysilylalkylenedisilazane of the formula ##STR1## and a polyalkoxysilylalkylenesilylamine of the formula ##STR2## where x is 0 or 1; R is a saturated alkyl or aryl radical or mixture of radicals; R' is alkyl, aryl, or cellosolve (R) 2-alkylethanol radical, or mixture of radicals; R" is hydrogen, alkyl, aryl, or arylalkyl radical or mixture of radicals; and A is a divalent hydrocarbon radical having 2 to 20 carbon atoms; and a method for their manufacture by the platinum catalyzed addition of an alkenyl- functional disilazane or silylamine with an alkoxy-functional silicon hydride is disclosed. The silylamine can also be produced by the platinum catalyzed addition of a SiH functional silazane of silylamine and an alkenyltrialkoxysilane.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: July 11, 1989
    Assignee: Dow Corning Corporation
    Inventors: Robert H. Krahnke, John C. Saam
  • Patent number: 4039666
    Abstract: Suppression of convulsions in warm-blooded animals is accomplished by administration of phenylsilanes of the formulas 0R.sub.2 SiX, 0RSiX.sub.2, 0SiX.sub.3, 0.sub.2 RSiX, and 0.sub.3 SiX in which R is an alkyl or alkenyl group and X is a hydroxyl group or one of several readily hydrolyzable radicals, such as the methoxy group. It should be understood that where there is more than one R or one X group in a composition, they need not be the same species.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: August 2, 1977
    Assignee: Dow Corning Corporation
    Inventors: Michael L. Chandler, Robert H. Krahnke, Robert R. LeVier