Patents by Inventor Olan W. Mitchell

Olan W. Mitchell 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: 5204307
    Abstract: Production of alkyl substituted aromatic diamines by reacting triethlyaluminum with an aromatic diamine and a chloride ion source in the presence of an olefin is disclosed. The alkyl substituted aromatic diamines are useful as chain extenders in polyurethane processes.
    Type: Grant
    Filed: January 13, 1992
    Date of Patent: April 20, 1993
    Assignee: Ethyl Corporation
    Inventors: Kryn G. Ihrman, Olan W. Mitchell, R. Woodrow Wilson, Jr.
  • Patent number: 5103059
    Abstract: Production of alkyl substituted aromatic diamines by reacting triethylaluminum with an aromatic diamine and a chloride ion source in the presence of an olefin is disclosed. The alkyl substituted aromatic diamines are useful as chain extenders in polyurethane processes.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: April 7, 1992
    Assignee: Ethyl Corporation
    Inventors: Kryn G. Ihrman, Olan W. Mitchell, R. Woodrow Wilson, Jr.
  • Patent number: 5059722
    Abstract: Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to the use of liquid bromine feed to a methanol-bisphenol-A solution. The process is readily adapted to large scale equipment by circulating the reaction mixture from the reaction vessel through an external closed loop which includes an impingement mixer. The bromine-methanol feed is pumped at the proper rate and ratio into the impingement mixture whereby it impinges with the circulating reaction mixture. The resultant bromination mixture is then returned to the reaction vessel.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: October 22, 1991
    Assignee: Ethyl Corporation
    Inventors: Olan W. Mitchell, Bonnie G. McKinnie
  • Patent number: 4909997
    Abstract: Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to the use of liquid bromine feed to a methanol-bisphenol-A solution. The process is readily adapted to large scale equipment by circulating the reaction mixture from the reaction vessel through an external closed loop which includes an impingement mixer. The bromine-methanol feed is pumped at the proper rate and ratio into the impingement mixture whereby it impinges with the circulating reaction mixture. The resultant bromination mixture is then returned to the reaction vessel.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: March 20, 1990
    Assignee: Ethyl Corporation
    Inventors: Olan W. Mitchell, Bonnie G. McKinnie
  • Patent number: 4783556
    Abstract: Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to the use of liquid bromine feed to a methanol-bisphenol-A solution. The process is readily adapted to large scale equipment by circulating the reaction mixture from the reaction vessel through an external closed loop which includes an impingement mixer. The bromine-methanol feed is pumped at the proper rate and ratio into the impingement mixture whereby it impinges with the circulating reaction mixture. The resultant bromination mixture is then returned to the reaction vessel.
    Type: Grant
    Filed: November 27, 1987
    Date of Patent: November 8, 1988
    Assignee: Ethyl Corporation
    Inventors: Olan W. Mitchell, Bonnie G. McKinnie
  • Patent number: 4701568
    Abstract: Tetrabromobisphenol-A is made in high purity by contacting a solution of bisphenol-A dissolved in a C.sub.1 -C.sub.4 alkanol with gaseous bromine.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: October 20, 1987
    Assignee: Ethyl Corporation
    Inventors: Bonnie G. McKinnie, Olan W. Mitchell
  • Patent number: 4628124
    Abstract: Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to use of liquid bromine feed.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: December 9, 1986
    Assignee: Ethyl Corporation
    Inventors: Bonnie G. McKinnie, Olan W. Mitchell