Patents by Inventor Vernon M. Wald

Vernon M. Wald 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).

  • Abrasive grain, method of making same and abrasive products
    Patent number: 5213591
    Abstract: An improved abrasive grain comprising the sintered product of a porous non-sintered particle having a coating of inorganic material thereon is provided. A preferred method of making such abrasive grains comprises coating the porous base particles with inorganic particles. The preferred step of coating comprises a step of mixing the base particles with a suspension containing the inorganic particles in a carrier fluid. The porous base particles having the coating of inorganic particles thereon are sintered, to generate the ceramic abrasive grain product. The abrasive grains may be incorporated, to advantage, in a variety of abrasive products including for example bonded abrasives, nonwoven abrasive products and coated abrasive products.
    Type: Grant
    Filed: July 28, 1992
    Date of Patent: May 25, 1993
    Inventors: Ahmet Celikkaya, Jerald A. Scherger, Vernon M. Wald
  • Shelling-resistant abrasive grain, a method of making the same, and abrasive products
    Patent number: 5102429
    Abstract: Sinter ceramic abrasive grains having increased surface area and a method of making the same are provided. The abrasive grains are incorporated into improved "shelling-resistant" abrasive articles such as coated abrasives, grinding wheels and non-woven abrasives. The ceramic abrasive grains are made by providing first particles comprising alpha-alumina precursor, introducing fine parpticles which can be sintered directly to the surface of the first particles upon sintering of the same, and heating the mixture of particles under sintering conditions to cause autogenous bonding of the fine particles of the surface of each of the first particles.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: April 7, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Vernon M. Wald, Robert S. Kirk
  • Shelling-resistant abrasive grain, a method of making the same, and abrasive products
    Patent number: 5011508
    Abstract: Sintered ceramic abrasive grains having increased surface area and a method of making the same are provided. The abrasive grains are incorporated into improved "shelling-resistant" abrasive articles such as coated abrasives, grinding wheels and non-woven abrasives. The ceramic abrasive grains are made by providing first particles comprising alpha-alumina precursor, introducing fine particles which can be sintered directly to the surface of the first particles upon sintering of the same, and heating the mixture of particles under sintering conditions to cause autogenous bonding of the fine particles to the surface of each of the first particles.
    Type: Grant
    Filed: October 14, 1988
    Date of Patent: April 30, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Vernon M. Wald, Robert S. Kirk
  • Coated abrasive products employing nonabrasive diluent grains
    Patent number: 5011512
    Abstract: A coated abrasive article comprised of a blend of premium abrasive grains and nonabrasive diluent grains adhered to a backing material by a resinous binder. The article has an unexpected abrading efficiency, performing equal to, or superior to, a coated abrasive article containing only premium abrasive grains.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: April 30, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Vernon M. Wald, Richard A. Masson, Fredrick D. Brown, David E. Broberg