Patents by Inventor Horst E. Zilch

Horst E. Zilch 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).

  • Inhibiting wax deposition from a wax-containing oil
    Patent number: 4905762
    Abstract: A method for inhibiting the deposition of wax in an oil well producing a wax-containing petroleum from a subterranean formation comprises injecting into the oil pool at the base of said well a copolymer comprised of ethylene and vinyl acetate and having an average molecular weight between about 15,000 and about 35,000.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: March 6, 1990
    Assignee: Union Oil Company of California
    Inventor: Horst E. Zilch
  • Composition and method for drilling a reservoir containing a high temperature aqueous liquid
    Patent number: 4039459
    Abstract: A composition and method for drilling a well into a subterranean reservoir containing a high temperature aqueous liquid which composition contains as a scale inhibitor (i) a water-soluble substituted iminodi(methylene phosphonic acid) compound having a carbon-to-phosphorus bond or a water-soluble salt thereof, (ii) a dicarboxylic acid, (iii) a lower alkyl ester or hydroxy derivative of a dicarboxylic acid, (iv) hexamethylenetetramine, (v) thiourea, or (vi) the amide reaction product of a polycarboxylic acid and an aliphatic amine, an aliphatic hydroxyl amine, or a heterocyclic nitrogen-containing compound.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: August 2, 1977
    Assignee: Union Oil Company of California
    Inventors: Paul W. Fischer, Horst E. Zilch
  • Inhibition of scale deposition in high temperature wells
    Patent number: 4032460
    Abstract: A method of inhibiting the formation of scale from aqueous solutions containing scale-forming ions at temperatures of up to 400.degree. F. and above during production and utilization of such aqueous solutions comprising adding to the solutions certain amines, amides, thioamides, carboxylic acids or amide reaction products of carboxylic acids and various amines.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: June 28, 1977
    Assignee: Union Oil Company of California
    Inventors: Horst E. Zilch, Paul W. Fischer
  • Method of inhibiting scale for high temperature steam wells
    Patent number: 3958635
    Abstract: A method of inhibiting the formation of scale from aqueous solutions containing scale-forming ions at temperatures of 400.degree. F. and above during production and utilization of such aqueous solutions comprising adding to the solutions certain substituted iminodi(methylene phosphonic acid) compounds or a water-soluble salt thereof.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: May 25, 1976
    Assignee: Union Oil Company of California
    Inventors: Horst E. Zilch, Paul W. Fischer