Patents by Inventor Harald Helletsberger

Harald Helletsberger 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).

  • Grinding disk
    Patent number: 4381188
    Abstract: An abrasive disk comprising abrasive grains such as corundum, a bonding material, for example a resin, and a filler material. At least part of the filler material is active in the grinding process.Particles of this filler material are provided in the disk in the form of pellets or granules. The pellets and granules preferably consist of more than one substance. One substance forms a matrix and at least one other substance is imbedded in said matrix.
    Type: Grant
    Filed: January 29, 1981
    Date of Patent: April 26, 1983
    Assignee: Tyrolit-Schleifmittelwerke Swarovski KG
    Inventors: Walter Waizer, Harald Helletsberger, Christof Kriegshaber, Volker Selgrad
  • Method of coating fibrous reinforcement material
    Patent number: 4338357
    Abstract: An improved method for coating fibers, for example, glass fibers, which are used in reinforcement webs for objects under high strain e.g. in grinding discs.The fibers are subjected to a two stage coating. In the first stage the fibers are coated with a liquid resin or resin solution.In the second stage resin in powdered form is deposited on the fibers.Thereafter, the fibers are subjected to a heat treatment.The products obtained are tacky to the touch and are used in this state in other mixtures of resinous binders and the like so that a good contact is made between the reinforcing material and the additional binder.
    Type: Grant
    Filed: November 26, 1980
    Date of Patent: July 6, 1982
    Assignee: Tyrolit Schleifmittelwerke Swarovski K.G.
    Inventors: Herwig Pichler, Harald Helletsberger, Ernst Geissler, Heinrich Ofer, Bernhard Fugenschuh
  • Method for improving the quality of abrasive grains
    Patent number: 4278449
    Abstract: Abrasive grain, corundum (Al.sub.2 O.sub.3) comprising titanium oxide, preferably Ti.sub.2 O.sub.3, is provided with a ceramic coating. The abrasive grain is subjected to a heat treatment whereby the Ti-oxides change from the trivalent into the quadrivalent degree of oxidation. The coating and the change of the degree of oxidation are effected simultaneously.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: July 14, 1981
    Assignee: Tyrolit-Schleifmittelwerke Swarovski K.G.
    Inventors: Harald Helletsberger, Anton Aichhorn, Erich Bogusch
  • Grinding wheel containing grain-coated reinforcement fibers and method of making it
    Patent number: 4259089
    Abstract: In a grinding disc reinforcement fibres of high strength are used and such fibres or normal glass fibres are covered with a protective coating including fine grain.
    Type: Grant
    Filed: November 9, 1979
    Date of Patent: March 31, 1981
    Assignee: Tyrolit Schleifmittelwerke Swarovski K.G.
    Inventors: Walter Waizer, Harald Helletsberger
  • Sample box
    Patent number: D431775
    Type: Grant
    Filed: August 30, 1999
    Date of Patent: October 10, 2000
    Assignee: Tyrolit Schleifmittelwerke Swarovski, K.G.
    Inventors: Hermann Plattner, Monika E. Oberleit, Ute Nalter, Wolfgang Huber, Peter Tobias, Harald Helletsberger, Anselm Kaspar