Patents by Inventor Stephen C. Cohen

Stephen C. Cohen 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).

  • Refrigeration lubricant for hydrofluorocarbon refrigerants
    Patent number: 6736991
    Abstract: A fluid refrigeration composition is disclosed that comprises a naphthenic mineral oil lubricant, a hydrofluorocarbon refrigerant that is immiscible with the naphthenic mineral oil lubricant, and an effective amount of at least one nonionic surfactant; wherein said surfactant has a Hydrophilic-Lipophilic Balance in the range of from about 9.8 to about 11.8, is completely soluble in the naphthenic mineral oil lubricant, and has a low pour point; and wherein the blend of surfactant and lubricant is completely clear and transparent and has a low pour point.
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: May 18, 2004
    Assignee: Crompton Corporation
    Inventors: Stephen C. Cohen, Michael Costello
  • Synergistic antioxidant system for severely hydrocracked lubricating oils
    Patent number: 5124057
    Abstract: Lubricant compositions are disclosed in which a synergistic combination of low-volatility tri-substituted phosphite and selected substituted isocyanurate phenolic stabilizers provide surprisingly effective antioxidant qualities to lubricating oils selected from hydrotreated oils, poly-.alpha.-olefin oils, paraffinic white oils and mixtures thereof.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: June 23, 1992
    Assignee: Petro-Canada Inc.
    Inventor: Stephen C. Cohen
  • Lubricating oil compositions containing novel combination of stabilizers
    Patent number: 4652385
    Abstract: Lubricant compositions are disclosed in which a synergistic combination of low-volatility tri-substituted phosphite and low-volatility sterically hindered phenolic stabilizers provide surprisingly effective antioxidant qualities to lubricating oils selected from hydrotreated oils, poly-alpha-olefin oils and paraffinic white oils, and mixtures thereof.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: March 24, 1987
    Assignee: Petro-Canada Inc.
    Inventor: Stephen C. Cohen
  • Metal cold forming process and lubricant composition therefor
    Patent number: 3992303
    Abstract: A method of cold forming ferrous metals is disclosed employing as a cold-forming lubricant a dry solid coating comprising a film of a chlorine-containing, film-forming polymer and a destabilizing agent applied to the surface of a ferrous metal workpiece, which surface is free from other coatings or surface treatment, said coating being applied as a liquid composition and to particular coating compositions.
    Type: Grant
    Filed: January 22, 1976
    Date of Patent: November 16, 1976
    Assignee: Van Straaten Chemical Company
    Inventors: George E. Barker, Stephen C. Cohen, John L. O'Brien, Jack Milgrom
  • Metal cold forming process and lubricant composition therefor
    Patent number: 3978702
    Abstract: A method of cold forming ferrous metals is disclosed employing as a cold-forming lubricant a dry solid coating comprising a film of a chlorine-containing, film-forming polymer and a destabilizing agent applied to the surface of a ferrous metal workpiece, which surface is free from other coatings or surface treatment, said coating being applied as a liquid composition and to particular coating compositions.
    Type: Grant
    Filed: November 12, 1975
    Date of Patent: September 7, 1976
    Assignee: Van Straaten Chemical Company
    Inventors: George E. Barker, Stephen C. Cohen, John L. O'Brien, Jack Milgrom