Patents by Inventor Lambertus P. G. Hawinkels

Lambertus P. G. Hawinkels 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).

  • Process for preparing cyanuric acid
    Patent number: 4174444
    Abstract: An improved process for the manufacture of cyanuric acid by heating a reaction solution of urea, biuret, or mixtures thereof, in a solvent and stripping the reaction solution with a stripping gas. The process recycles waste gas produced by the reaction solution as the stripping gas.
    Type: Grant
    Filed: March 27, 1978
    Date of Patent: November 13, 1979
    Assignee: Stamicarbon, B.V.
    Inventors: Marinus J. A. M. den Otter, Lambertus P. G. Hawinkels, Augustinus P. H. Schouteten
  • Process for purifying cyanuric acid
    Patent number: 3994892
    Abstract: The process of the invention is directed to an improvement in purifying cyanuric acid which contains as a contaminant, an enclosed residue of a solvent used in the reaction mediums to produce cyanuric acid from urea, biuret or mixtures thereof. The process comprises suspending the impure cyanuric acid in an aqueous medium and stirring. As a result of the process, cyanuric acid is substantially freed from enclosed residues of contaminants solvents.
    Type: Grant
    Filed: October 29, 1975
    Date of Patent: November 30, 1976
    Assignee: Stamicarbon B.V.
    Inventors: Marinus J. A. M. Den Otter, Augustinus P. H. Schouteten, Lambertus P. G. Hawinkels
  • Process for the preparation of cyanuric acid
    Patent number: 3956299
    Abstract: An improved process for forming cyanuric acid wherein urea and/or biuret, dissolved in a solvent, are heated in the presence of a dissolved acid or a corresponding anhydride or ammonium salt to produce cyanuric acid so that byproducts ammeline and ammelide are produced in amounts no greater than 1 % by weight of the product.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: May 11, 1976
    Assignee: Stamicarbon B.V.
    Inventors: Marinus J. A. M. den Otter, Lambertus P. G. Hawinkels, Augustinus P. H. Schouteten