Patents by Inventor Petrus H. M. Schreurs

Petrus H. M. Schreurs 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: 4391962
    Abstract: An improved process for the suspension polymerization of vinyl chloride in the presence of a radical initiator and at least two suspension stabilizers is disclosed. The improvement comprises performing the polymerization in the presence of at least one primary stabilizer selected from the group consisting of water-soluble partially hydrolyzed polyvinyl acetates and methyl hydroxypropyl cellulose and at least one secondary stabilizer selected from the group consisting of N-alkyl gluconamides wherein the alkyl group contains from about 16 to about 20 carbon atoms.
    Type: Grant
    Filed: November 20, 1980
    Date of Patent: July 5, 1983
    Assignee: Akzona Incorporated
    Inventors: Petrus H. M. Schreurs, Willem F. Verhelst
  • Patent number: 4390451
    Abstract: The present invention relates to a concentrated aqueous composition of metal aldonate and/or ammonium aldonate. Part of the aldonate is dissolved and part of it is suspended in the water. Sodium gluconate is preferred. The present composition should contain a colloidally dispersed gum as suspending agent. Gums containing carboxyl groups such as xanthan gum are particularly well suited for making the suspension. In this manner, stable compositions having a high aldonate content are obtained. The composition can be used in cleansing preparations for glass and metal surfaces, in solution for etching aluminum, in galvanizing processes, in the tanning of leather, in paper making, in treatment of textiles, in paint removers, fixing baths in photography, and in agricultural and pharmaceutical preparations.
    Type: Grant
    Filed: June 16, 1981
    Date of Patent: June 28, 1983
    Assignee: AKZO N.V.
    Inventors: Reginoldus Havinga, Reinder Torenbeek, Petrus H. M. Schreurs