Patents by Inventor John M. Jenkins, III

John M. Jenkins, III 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).

  • Patent number: 5399320
    Abstract: A method of terminating, under emergency conditions, an olefin polymerization reaction conducted in the presence of a transitioned metal based catalyst in a gas phase reactor by using a recycle gas from the reactor or a feed stream to the reactor to operate an expander associated with a circulator which maintains fluidized conditions in the reactor while introducing a kill gas into the reactor to terminate the reaction.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: March 21, 1995
    Inventors: Roy E. Craddock, III, John M. Jenkins, III, Michael T. Tighe
  • Patent number: 5270408
    Abstract: A method of terminating, under emergency conditions, an olefin Polymerization reaction conducted in the presence of a transitioned metal based catalyst in a gas phase reactor by using a recycle gas from the reactor or a feed stream to the reactor to operate an expander associated with a circulator which maintains fluidized conditions in the reactor while introducing a kill gas into the reactor to terminate the reaction.
    Type: Grant
    Filed: January 29, 1992
    Date of Patent: December 14, 1993
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Roy E. Craddock, III, John M. Jenkins, III, Michael T. Tighe
  • Patent number: 4956426
    Abstract: A method and system for regulating the isotacticity of polypropylene in a continuous process for manufacturing polypropylene by the polymerization of alpha-olefins in a fluidized bed reactor system using a model which correlates isotacticity values to catalyst productivity values. A catalyst productivity target value is computed using the model based upon a selected xylene solubles or isotactic index. The instantaneous catalyst productivity of the system is then determined by dividing product production rate by catalyst flow rate which is then compared to the catalyst productivity target value. When the comparison between the instantaneous catalyst productivity value and the catalyst productivity differ the molar feed ratio of SCA to alkyl is automatically adjusted until the catalyst productivity, and hence isotacticity, is changed approaching the target values.
    Type: Grant
    Filed: July 24, 1986
    Date of Patent: September 11, 1990
    Assignee: Union Carbide Chemicals and Plastics Company Inc.
    Inventors: George G. Ardell, Reginald W. Geck, John M. Jenkins, III, William G. Sheard
  • Patent number: 4956427
    Abstract: A method for the prevention of fouling of metallic surfaces exposed to reactive alpha-olefin gases during the production of polymeric resins which comprise coating such metallic surfaces with an amino silicone fluid and thereafter curing said coating by hydrolysis to form a continuous solid coating.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: September 11, 1990
    Assignee: Union Carbide Chemicals and Plastics Company Inc.
    Inventors: John M. Jenkins, III, James D. McCullough, Jr., Steven P. Sawin
  • Patent number: 4876320
    Abstract: A process for reducing sheeting during production of polyolefins by polymerization of alpha-olefins utilizing titanium based polymerization catalysts wherein the static electric charges in the reactor at the side of possible sheet formation are maintained below static voltage levels which would otherwise cause sheet formation.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: October 24, 1989
    Assignee: Union Carbide Chemicals and Plastics Company Inc.
    Inventors: Bernard D. Fulks, Steven P. Sawin, Collin D. Aikman, John M. Jenkins, III
  • Patent number: 4792592
    Abstract: A process for reducing sheeting during production of polyolefins by polymerization of alpha-olefins utilizing titanium based polymerization catalysts wherein the static electric charges in the reactor at the site of possible sheet formation are maintained below static voltage levels which would otherwise cause sheet formation.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: December 20, 1988
    Assignee: Union Carbide Corporation
    Inventors: Bernard D. Fulks, Steven P. Sawin, Collin D. Aikman, John M. Jenkins, III
  • Patent number: 4588790
    Abstract: A continuous gas fluidized bed process is disclosed for the production of polymer from monomer wherein a gaseous stream comprising monomer is passed through a fluidized bed in a reaction zone in the presence of catalyst under reactive conditions, withdrawing from the reaction zone polymeric product and a stream comprising unreacted gases and solid particles, cooling the stream and recycling the cooled stream to the reaction zone together with sufficient additional monomer to replace monomer polymerized and withdrawn as polymer product, and wherein at least a part of the recycle stream is cooled to condense a portion thereof and form a liquid-containing mixture wherein the weight ratio of liquid to solid particles is not less than about two to one, and introducing the mixture into the reaction zone wherein the liquid in the mixture is vaporized.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: May 13, 1986
    Assignee: Union Carbide Corporation
    Inventors: John M. Jenkins, III, Russell L. Jones, Thomas M. Jones, Samil Beret
  • Patent number: 4543399
    Abstract: A process is described for increasing the space time yield of polymer production in a fluidized bed reactor employing an exothermic polymerization reaction by cooling the recycle stream to below its dew point and returning the resultant two-phase fluid stream to the reactor to maintain the fluidized bed at a desired temperature above the dew point of the recycle stream.
    Type: Grant
    Filed: April 3, 1984
    Date of Patent: September 24, 1985
    Assignee: Union Carbide Corporation
    Inventors: John M. Jenkins, III, Russell L. Jones, Thomas M. Jones
  • Patent number: 4532311
    Abstract: A process for reducing sheeting during production of polyolefins by polymerization of alpha-olefins utilizing titanium based polymerization catalysts wherein the static electric charges in the reactor at the site of possible sheet formation are maintained below static voltage levels which would otherwise cause sheet formation.
    Type: Grant
    Filed: September 14, 1984
    Date of Patent: July 30, 1985
    Assignee: Union Carbide Corporation
    Inventors: Bernard D. Fulks, Steven P. Sawin, Collin D. Aikman, John M. Jenkins, III
  • Patent number: 4371977
    Abstract: A method for detecting solidification in a mixed phase low pressure fluidized bed olefin polymerization reactor having volume comprising:A. disposing a radiation source and a radiation detector such that radiation from said radiation source will pass through a radiation path through at least a portion of the volume of said container to reach said radiation detector,B. detecting solidification in said radiation path by noting a decrease in the amount of radiation reaching said radiation detector.
    Type: Grant
    Filed: June 17, 1980
    Date of Patent: February 1, 1983
    Assignee: Union Carbide Corporation
    Inventors: John M. Jenkins, III, Max E. Carter, Sr., Michael L. Green, Marvin E. Cavender