Patents by Inventor David Y. Dollman

David Y. Dollman 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).

  • Composition and process for treating metal
    Patent number: 5534082
    Abstract: Heating an aqueous mixture of a fluoroacid such as H.sub.2 TiF.sub.6 and an oxide, hydroxide, and/or carbonate such as silica produces a clear mixture with long term stability against settling of any solid phase, even when the oxide, hydroxide, or carbonate phase before heating was a dispersed solid with sufficiently large particles to scatter light and make the mixture before heating cloudy. The clear mixture produced by heating can either be mixed with water soluble and/or water dispersible polymers, for example with dispersed polymers of the diglycidyl ether of bisphenol-A or an acrylic acid polymer, or with soluble hexavalent and/or trivalent chromium, to produce a composition that improves the corrosion resistance of metals treated with the composition, especially after subsequent painting.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: July 9, 1996
    Assignee: Henkel Corporation
    Inventors: David Y. Dollman, deceased, Shawn E. Dolan, Lester E. Steinbrecher
  • Alkaline cleaner for aluminum
    Patent number: 4762638
    Abstract: A cleaning composition bath, concentrate for its preparation, and method of use of an aqueous alkaline cleaner comprising an ethylenediaminetetraacetic acid or nitrilotriacetic acid alkali metal salt, an inorganic alkali metal phosphate, a surfactant and optionally an aluminum sequestrant, other inorganic salts and an alkali metal hydroxide, if needed, to adjust the pH of the composition to at least 11.0.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: August 9, 1988
    Assignee: Amchem Products, Inc.
    Inventors: David Y. Dollman, Stanley L. Blaszczyk
  • Method for the production of chromium phosphate coatings
    Patent number: 4668305
    Abstract: The life of chromium phosphate coating baths is extended by at least fully restoring depleted Cr.sup.VI ; bath efficiencies are significantly improved.
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: May 26, 1987
    Assignee: Amchem Products, Inc.
    Inventors: David Y. Dollman, Mark W. McMillen
  • Non-fluoride acid compositions for cleaning aluminum surfaces
    Patent number: 4668421
    Abstract: Compositions and methods for cleaning aluminum surfaces wherein the cleaning compositions contain sulfuric acid, phosphoric acid, and at least one surfactant.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: May 26, 1987
    Assignee: Amchem Products, Inc.
    Inventor: David Y. Dollman
  • Non-fluoride acid compositions for cleaning aluminum surfaces
    Patent number: 4435223
    Abstract: Compositions and methods for cleaning aluminum surfaces wherein the cleaning compositions contain sulfuric acid, phosphoric acid, and at least one surfactant.
    Type: Grant
    Filed: May 18, 1982
    Date of Patent: March 6, 1984
    Assignee: Amchem Products, Inc.
    Inventor: David Y. Dollman
  • Composition and method for acid cleaning of aluminum surfaces
    Patent number: 4370173
    Abstract: Lubricating oils and aluminum fines are removed from aluminum surfaces by contacting the surfaces with an aqueous solution containing sulfuric acid, hydrofluoric acid, and an alkali metal 2-butoxyethoxyacetate anionic surfactant. The solution may also contain one or more low foaming nonionic surfactants.
    Type: Grant
    Filed: April 30, 1982
    Date of Patent: January 25, 1983
    Assignee: Amchem Products, Inc.
    Inventor: David Y. Dollman
  • Method and compositions for coating aluminum
    Patent number: 4191596
    Abstract: This invention relates to a method and compositions for coating aluminum in order to improve both corrosion resistance and paint adhesion. By using a coating composition consisting essentially of (a) polyacrylic acid or esters thereof and (b) at least one acid selected from the group consisting of H.sub.2 ZrF.sub.6, H.sub.2 TiF.sub.6, and H.sub.2 SiF.sub.6, the characteristics of the treated aluminum surfaces are improved, while process waste disposal problems associated with conventional chrome/phosphate coating are avoided.
    Type: Grant
    Filed: September 6, 1978
    Date of Patent: March 4, 1980
    Assignee: Union Carbide Corporation
    Inventors: David Y. Dollman, Timothy J. O'Grady