Patents by Inventor Alfred Bosshard

Alfred Bosshard 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).

  • Ultrafine natural calcium carbonates as fillers in varnishes and paints
    Patent number: 4013602
    Abstract: A varnish or paint containing ultrafine natural calcium carbonate as a filler, the carbonate having an average statistical particle diameter of from 0.5 to 0.7 .mu. and a maximum diameter of from 3 to 4 .mu..
    Type: Grant
    Filed: April 14, 1975
    Date of Patent: March 22, 1977
    Assignee: Pluss-Staufer AG
    Inventors: Pierre Delfosse, Alfred Bosshard
  • Use of ultrafine natural calcium carbonates as fillers in natural and synthetic polymers
    Patent number: 3959192
    Abstract: Filled polymer containing natural calcium carbonate having a statistical particle diameter of from 0.5 to 0.7 micron and average maximum diameter of from 3 to 4 microns.
    Type: Grant
    Filed: March 7, 1975
    Date of Patent: May 25, 1976
    Assignee: Pluss-Staufer Ag
    Inventors: Pierre Delfosse, Alfred Bosshard
  • Ultrafine natural calcium carbonates as coating pigments in coated papers
    Patent number: 3940550
    Abstract: A coated paper comprising an ultrafine natural calcium carbonate as a pigment, which has an average statistical particle diameter of from 0.5 to 0.7 .mu.m, a maximum diameter of from 3.0 to 4.0 .mu.m, and a specific surface area of at least 12sq.m./g.
    Type: Grant
    Filed: October 15, 1973
    Date of Patent: February 24, 1976
    Assignee: Pluss-Staufer AG
    Inventors: Pierre Delfosse, Alfred Bosshard
  • Process for the wet grinding of materials
    Patent number: 3934825
    Abstract: A process is disclosed for the wet grinding of a material such as chalk comprising the steps of preparing a suspension containing material particles no coarser than 43 microns and grinding the material in suspension using grinding bodies having a density of at least 3.7 g/cc, wherein the weight ratio of the grinding bodies to the material is at least 6:1. Specific types of grinding bodies are also disclosed.
    Type: Grant
    Filed: October 23, 1973
    Date of Patent: January 27, 1976
    Assignee: Pluss-Staufer AG
    Inventors: Pierre Delfosse, Alfred Bosshard