Patents by Inventor Reginoldus Havinga

Reginoldus Havinga 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).

  • Concentrated aqueous metal aldonate and/or ammonium aldonate composition
    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
  • Radiation acid curable resin compositions and process for curing them
    Patent number: 4115224
    Abstract: A process for curing acid-curable resins with photocatalyst compounds having the general formula: ##STR1## WHEREIN M = 0, 1 OR 2 AND P IS AN INTEGER FROM 1 TO 5 AND WHEREIN, WHEN P IS 1, R represents an alkyl or alkoxy group having at least 4 C-atoms, and when p>1, R represents alkyl or alkoxy groups having together at least 4 C-atoms. The photocatalyst which may be used is 2,2,2-trichloro-4'-tert-butylacetacetophenone. This compound may be prepared by chlorinating 4'-tert-butylacetophenone or by treating tert-butyl benzene in carbon disulfide with trichloroacetyl chloride or trichloroacetonitrile and aluminum chloride.
    Type: Grant
    Filed: July 5, 1974
    Date of Patent: September 19, 1978
    Assignee: Akzo NV
    Inventors: Reginoldus Havinga, Pieter Dirk Swaters
  • Compositions curable by exposure to ultra violet light in the presence of chloro-substituted acetophenones
    Patent number: 4001098
    Abstract: Compositions which are curable with ultra violet light comprise a polyester containing ethylenic unsaturation and a chloro-alkyl acetophenone or chloro-alkoxy acetophenone photocatalyst.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: January 4, 1977
    Assignee: Akzona Incorporated
    Inventors: Pieter Dirk Swaters, Reginoldus Havinga, Tjerk VAN DER Hauw
  • Process for the preparation of cycloalkylalkane carboxylic acid
    Patent number: 3933903
    Abstract: A process is disclosed for effectively producing a cycloalkylalkane carboxylic acid by reacting a cyclic ketone or a cyclic alcohol with a molten alkali metal hydroxide using a two step temperature treatment during the reaction wherein the first step temperature ranges from 200.degree. to 270.degree.C and the second step temperature ranges from 290.degree. to 350.degree.C. The alkali metal soap is then converted to the free acid. The process is especially directed to the manufacture of cyclopentylpropionic acid.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: January 20, 1976
    Assignee: Akzo N.V.
    Inventors: Reginoldus Havinga, Antoon Wildschut