Patents by Inventor Richard Schmidlkofer

Richard Schmidlkofer 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).

  • Storage-stable polysiloxane composition which gives permanently water-wettable vulcanizates
    Patent number: 5580921
    Abstract: The present invention relates to storage-stable polysiloxane compositions which give permanently water-wettable elastomers. The polysiloxane compositions of the present invention which vulcanize to yield elastomers are useful as dental impression compositions.
    Type: Grant
    Filed: February 10, 1994
    Date of Patent: December 3, 1996
    Assignee: Wacker-Chemie GmbH
    Inventors: Michael Stepp, Heinz Hefner, deceased, Peter Huber, Johann Mueller, Richard Schmidlkofer, Arnold Garhammer
  • Impression compositions and process for preparing impressions
    Patent number: 4222983
    Abstract: Impression compositions containing (a) an organopolysiloxane having at least two alkenyl groups and containing at least 20 mol percent of monoorganosiloxane units, (b) an organopolysiloxane having at least 3 Si-bonded hydrogen atoms per molecule, (c) a catalyst which promotes the addition of Si-bonded hydrogen atoms to alkenyl groups and (d) 30 to 90 percent by weight of a filler, based on the total weight of the composition. Impressions are obtained by applying a composition containing components (a), (b), (c) and (d) to a surface of which an impression is to be made, crosslinking said composition and thereafter removing the formed structure from the contacted surface.
    Type: Grant
    Filed: July 27, 1978
    Date of Patent: September 16, 1980
    Assignee: Wacker-Chemie GmbH
    Inventors: Peter August, Wolfgang Hechtl, Richard Schmidlkofer
  • Process for controlling the rate of platinum induced addition reaction of silicon bonded hydrogen atoms to organopolysiloxanes containing aliphatic unsaturation
    Patent number: 4096159
    Abstract: A process for controlling the rate of addition of silicon bonded hydrogen atoms to organopolysiloxanes containing aliphatic unsaturation which comprises mixing (1) an organopolysiloxane containing silicon bonded hydrogen atoms and/or (2) an organopolysiloxane containing at least 50 silicon atoms per molecule and having aliphatically unsaturated groups with at least one organosilicon compound of the formulaCH.sub.2 .dbd.CHR.sub.2 SiO(SiR.sub.2 O).sub.n SiR.sub.2 CH.dbd.CH.sub.2in which R is a hydrocarbon radical or a substituted hydrocarbon radical free of aliphatic unsaturation and n is a number of from 0 to 6 prior to combining the organopolysiloxanes (1) and (2) in the presence of a platinum catalyst. The composition thus obtained has a substantially longer pot-life while only slightly extending the curing time.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: June 20, 1978
    Assignee: Wacker-Chemie GmbH
    Inventors: Wolfgang Hechtl, Ernst Wohlfahrt, Richard Schmidlkofer
  • Paste-like mixtures containing a cross-linking agent and a condensation catalyst
    Patent number: 3957683
    Abstract: The invention relates to paste-like mixtures that are used in the preparation of room temperature vulcanizable compositions comprising a cross-linking agent, a condensation catalyst and a hydrophobic silicon dioxide thickening agent which is solid at room temperature.
    Type: Grant
    Filed: March 18, 1974
    Date of Patent: May 18, 1976
    Assignee: Wacker-Chemie GmbH
    Inventors: Paul Hittmair, Wolfgang Hechtl, Ernst Wohlfarth, Richard Schmidlkofer