Patents by Inventor Karl J. Warren

Karl J. Warren 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).

  • PERFLUOROKETONES AS GASEOUS DIELECTRICS
    Publication number: 20120280189
    Abstract: A gaseous dielectric comprising a perfluoroketone of the formula Rf1—CO—Rf2, wherein each of Rf1 and Rf2 are perfluoroaliphatic groups, and use thereof in electrical devices, is described.
    Type: Application
    Filed: January 19, 2011
    Publication date: November 8, 2012
    Inventors: Karl J. Warren, Phillip E. Tuma, John G. Owens, Richard M. Minday
  • Non-recirculating, die supplied doctored roll coater with solvent addition
    Patent number: 5628827
    Abstract: A coater incorporates a die, a reservoir, a gravure cylinder, and a doctor blade for applying coating fluid to a moving surface. The flow rate of coating fluid to the gravure cylinder is controlled to equal the rate at which coating fluid is consumed by the coating process. This eliminates the need to recycle surplus coating fluid. The coating fluid can be quickly and conveniently replaced with a solvent in the reservoir when coating is not being performed to reduce the occurrence of coating defects arising from excessive evaporation of solvent and premature solidification of coating fluid.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: May 13, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert P. McCollam, Norman E. Gehrke, Karl J. Warren, Mark D. Larson, George D. Kostuch, Thomas W. Braid
  • Ultrasonically assisted coating method
    Patent number: 5376402
    Abstract: An ultrasonically assisted coating method for applying a smooth layer of coating material on a surface of a moving web are disclosed. A coating material is applied onto one web surface. An ultrasonic energy generator excites the line of initial contact between the coating material and the web at a uniform ultrasonic intensity selected in combination with the properties of the coating material. The coated web has a thin, uniform crossweb thickness with low thickness variations.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: December 27, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John W. Louks, Donald L. Pochardt, Robert B. Secor, Karl J. Warren
  • Ultrasonically assisted coating method
    Patent number: 5262193
    Abstract: An ultrasonically assisted coating method for applying a smooth layer of coating material on a surface of a moving web are disclosed. A coating material is applied onto one web surface. An ultrasonic energy generator excites the line of initial contact between the coating material and the web at a uniform ultrasonic intensity selected in combination with the properties of the coating material. The coated web has a thin, uniform crossweb thickness with low thickness variations.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: November 16, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John W. Louks, Donald L. Pochardt, Robert B. Secor, Karl J. Warren
  • Separation of acetone from methanol by extractive distillation
    Patent number: 4620901
    Abstract: Acetone cannot be completely removed from acetone-methanol mixtures by distillation because of the presence of the minimum boiling azeotrope. Acetone can be readily separated from methanol by using extractive distillation in which the extractive agent is dimethylformamide, either alone or admixed with other compounds. Typical examples of effective agents are: dimethylformamide; dimethylformamide and diethylene glycol; dimethyl formamide, glycerine and propylene glycol.
    Type: Grant
    Filed: November 4, 1985
    Date of Patent: November 4, 1986
    Inventors: Lloyd Berg, Karl J. Warren
  • Separation of acetone from methanol by extractive distillation
    Patent number: 4584063
    Abstract: Acetone cannot be completely removed from acetone-methanol mixtures by distillation because of the presence of the minimum boiling azeotrope. Acetone can be readily separated from methanol by using extractive distillation in which the extractive agent is a higher boiling oxygenated, nitrogenous and/or sulfur-containing organic compound or a mixture of two or more of these. Typical examples of effective agents are: Glycerine, 1,5-Pentanediol, Dimethylsulfoxide, n-Hexanol, Dioctyl phthalate and N,N-Dimethylacetamide.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: April 22, 1986
    Inventors: Lloyd Berg, Karl J. Warren