Patents by Inventor Robert B. Rashbrook

Robert B. Rashbrook 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).

  • Poly(2-methyl-1,5-pentylene)terephthalamide: a method of using: a method of spinning: and a method of making
    Patent number: 5162152
    Abstract: Poly(2-methyl-1,5-pentylene) terephthalamide is discussed herein. It is manufactured in a process starting with a nylon salt made from terephthalic acid and 2-methyl-1,5-pentylene diamine and an excess amount of the diamine. The polymer is spun to form monofilaments. The monofilaments may be used, among other things, to form dryer screens for use in a paper forming process.
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: November 10, 1992
    Assignee: Hoechst Celanese Corporation
    Inventor: Robert B. Rashbrook
  • Dryer screen made from poly(2-methyl-1,5-pentylene) terephthalamide
    Patent number: 5112685
    Abstract: Poly(2-methyl-1,5-pentylene) terephthalamide is discussed herein. It is manufactured in a process starting with a nylon salt made from terephthalic acid and 2-methyl-1,5-pentylene diamine and an excess amount of the diamine. The polymer is spun to form monofilaments. The monofilaments may be used, among other things, to form dryer screens for use in a paper forming process.
    Type: Grant
    Filed: February 11, 1991
    Date of Patent: May 12, 1992
    Assignee: Hoechst Celanese Corporation
    Inventors: Robert B. Rashbrook, Clyde W. Alexander, Edward C. Bland
  • Method of preparing polyesters modified with trihydroxybenzophenone
    Patent number: 4354016
    Abstract: UV stable linear polyesters, e.g. polyethylene terephthalate, contain in their chain copolymerized 2-hydroxy-di(hydroxyalkoxy)benzophenone. The polyesters are useful for making biaxially oriented films. The polyesters can be made by polycondensation in the presence of 2,4,4'-trihydroxybenzophenone.
    Type: Grant
    Filed: November 28, 1980
    Date of Patent: October 12, 1982
    Assignee: Imperial Chemical Industries Limited
    Inventors: Robert B. Rashbrook, Patrick J. Horner
  • Polyester compositions containing residues of dihydroxyalkoxy coumarins
    Patent number: 4347350
    Abstract: UV stable linear polyesters, e.g. polyethylene terephthalate, contain in their chain copolymerized esterification residues of di(hydroxyalkoxy)coumarins. The polyesters are useful for making biaxially oriented films. The polyesters can be made by polycondensation in the presence of 4-methyl-6,7-dihydroxy-coumarin.
    Type: Grant
    Filed: November 28, 1980
    Date of Patent: August 31, 1982
    Assignee: Imperial Chemical Industries Limited
    Inventors: Patrick J. Horner, Robert B. Rashbrook
  • Polyester films
    Patent number: 4203888
    Abstract: Oriented flame retardant films are made from linear polyester compositions containing an aryl diphosphate.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: May 20, 1980
    Assignee: ICI Americas Inc.
    Inventor: Robert B. Rashbrook
  • Phosphorus and linear polyester compositions and products containing them
    Patent number: 4134876
    Abstract: The new compounds are phosphates derived from mono- and di-hydric phenols with blocking groups on at least 75% of the ring carbon atoms adjacent to the carbon atoms attached to the phosphate groups, e.g. phosphates derived from 2,6-dimethyl phenol and 3,3',5,5'-tetramethyl-4,4'-dihydroxybiphenyl.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: January 16, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventors: Patrick J. Horner, Robert B. Rashbrook
  • Polyester production
    Patent number: 4133800
    Abstract: Polyesters, e.g. polyethylene terephthalate, are produced by a direct esterification process. The esterification is performed in the presence of a germanium dioxide polycondensation catalyst dissolved in an alkaline ethylene glycol solution. The alkali in the catalyst solution acts as the softening point stabilizer. An antimony polycondensation catalyst is also employed.
    Type: Grant
    Filed: November 15, 1976
    Date of Patent: January 9, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventors: Robert P. L. V. Taubinger, Robert B. Rashbrook