Patents by Inventor Lothar S. Sander

Lothar S. Sander 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).

  • Methods and compositions for pretreatment of metals
    Patent number: 5612421
    Abstract: Methods and compositions for pretreating a metal surface are provided. The methods comprise applying to the metal surface a hydrolysate of a copolymer of an unsaturated carboxylic acid or derivative thereof and a vinyltrialkoxysilane compound. Novel zinc salt hydrolysate compositions and zirconium salt hydrolysate compositions are also disclosed.
    Type: Grant
    Filed: March 5, 1996
    Date of Patent: March 18, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Alan E. Goliaszewski, David W. Reichgott, Lothar S. Sander
  • Methods and compositions for pretreatment of metals
    Patent number: 5518770
    Abstract: Methods and compositions for pretreating a metal surface are provided. The methods comprise applying to the metal surface a hydrolysate of a copolymer of an unsaturated carboxylic acid or derivative thereof and a vinyltrialkoxysilane compound. Novel zinc salt hydrolysate compositions and zirconium salt hydrolysate compositions are also disclosed.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: May 21, 1996
    Assignee: Betz Laboratories, Inc.
    Inventors: Alan E. Goliaszewski, David W. Reichgott, Lothar S. Sander
  • Composition and method for non-chromate coating of aluminum
    Patent number: 5129967
    Abstract: A chromate and phosphate free composition and method for forming a dried in place conversion coating for aluminum and aluminum alloys. The method entails the application of the composition to aluminum or aluminum alloys and allowing the composition to dry in place. The composition is an acidic aqueous solution preferably containing more than 8 grams per liter dihydrohexafluozirconic acid, more than 10 grams per liter polyacrylic acid and more than 0.17 grams per liter hydrofluoric acid in a ratio of 1:0.84:0.014. Up to about 0.6 gram per liter dihydrohexafluotitanic acid is added to facilitate analytical testing in aqueous systems. The solution forms a dried in place conversion coating having a weight of from 6 to 25 milligrams per square foot in treatment (contact and drying) times as short as 2 seconds.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: July 14, 1992
    Assignee: Betz Laboratories, Inc.
    Inventors: Lothar S. Sander, Edward M. Musingo, William J. Neill, David W. Reichgott
  • Composition and method for non-chromate coating of aluminum
    Patent number: 4921552
    Abstract: A chromate and phosphate free composition and method for forming a dried in place conversion coating for aluminum and aluminum alloys. The method entails the application of the composition to aluminum or aluminum alloys and allowing the composition to dry in place. The composition is an acidic aqueous solution preferably containing more than 8 grams per liter dihydro-hexafluozirconaic acid, more than 10 grams per liter polyacrylic acid and more than 0.17 grams per liter hydrofluoric acid in a ratio of 1:0.84:0.014. The solution forms a dried in place conversion coating having a weight of from 6 to 25 milligrams per square foot in treatment (contact and drying) times as short as 2 seconds.
    Type: Grant
    Filed: May 3, 1988
    Date of Patent: May 1, 1990
    Assignee: Betz Laboratories, Inc.
    Inventors: Lothar S. Sander, Edward M. Musingo, William J. Neill
  • Coating composition
    Patent number: 4475957
    Abstract: An acidic aqueous no-rinse solution for coating metallic surfaces to make them corrosion resistant containing hexavalent chromium, trivalent chromium, phosphoric acid, and a poly(alkyleneoxy) polymer. Said solution is stable at both high and low temperatures.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: October 9, 1984
    Assignee: Amchem Products, Inc.
    Inventor: Lothar S. Sander