Patents by Inventor Engelbert Pechhold

Engelbert Pechhold 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).

  • Perfluoroalkyl polyether glycols and their use
    Patent number: 5107033
    Abstract: Homo- and copolymers of 3-perfluoroalkyl-1,2-epoxypropane having a number average molecular weight between about 650 and 5000, preferably 1000 to 3000, are prepared by polymerizing 3-perfluoroalkyl-1,2-epoxypropane in the presence of an acidic catalyst and preferably a molecular weight controlling agent.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: April 21, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Engelbert Pechhold
  • Modified fluorocarbonylimino biurets
    Patent number: 4958039
    Abstract: Fluorocarbonylimino biurets derived from a tris(isocyanotoalkane)biuret, a fluoroaliphatic alcohol and a modifier group imports oil/water repellency, soil-release properties.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: September 18, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Engelbert Pechhold
  • Polyurethanes from oligomeric formal diols of THF copolymer glycols
    Patent number: 4383100
    Abstract: Oligomeric formal diols are prepared by coupling segments of copolyether glycols with formaldehyde. The formal diols are useful in preparing polyurethanes.
    Type: Grant
    Filed: January 19, 1982
    Date of Patent: May 10, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Engelbert Pechhold
  • Oligomeric formal diols of poly(tetramethylene ether) glycol and polyurethanes prepared therefrom
    Patent number: 4355119
    Abstract: Oligomeric formal diols are prepared by coupling segments of PTMEG, each having a molecular weight of 1000-3000, with formaldehyde. The formal diols are useful in preparing polyurethanes.
    Type: Grant
    Filed: November 6, 1981
    Date of Patent: October 19, 1982
    Assignee: E. I. DuPont de Nemours and Company
    Inventor: Engelbert Pechhold
  • Oligomeric formal diols of poly(tetramethylene ether) glycol and polyurethanes prepared therefrom
    Patent number: 4340719
    Abstract: Oligomeric formal diols are prepared by coupling segments of PTMEG, each having a molecular weight of 1000-3000, with formaldehyde. The formal diols are useful in preparing polyurethanes.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: July 20, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Engelbert Pechhold
  • Copolyether glycols of tetrahydrofuran and alkylene oxides having low oligomeric cyclic ether content
    Patent number: 4251654
    Abstract: Tetrahydrofuran/alkylene oxide polymerizates containing no more than 3%, by weight, of oligomeric cyclic ethers are prepared by extracting the ethers from a raw polymerizate with water.
    Type: Grant
    Filed: August 14, 1979
    Date of Patent: February 17, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ivan M. Robinson, Engelbert Pechhold
  • Polyurethanes prepared with tetrahydrofuran-alkylene oxide polymerizates having low oligomeric cyclic ether content
    Patent number: 4224432
    Abstract: The resistance to degradation on exposure to high temperatures, water and organic liquids of a polyurethane prepared by reacting a tetrahydrofuran/alkylene oxide polymerizate, an organic polyisocyanate and a chain extender is significantly improved by using a tetrahydrofuran/alkylene oxide polymerizate which contains no more than about 3%, by weight, of oligomeric cyclic ethers.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: September 23, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Engelbert Pechhold, Ivan M. Robinson
  • Block polymers of hydroquinone di-(.beta.-hydroxyalkyl) ethers or isomers thereof and tetrahydrofuran/alkylene oxide copolymers
    Patent number: 4211862
    Abstract: Block polymers containing hydroquinone di-(.beta.-hydroxyethyl) ether or one of its isomers or homologs as one of the constitutent blocks and a random copolymer of tetrahydrofuran and one or more alkylene oxides as one or more of the other constituent blocks are useful in preparing polyurethanes and polyesters.
    Type: Grant
    Filed: October 16, 1978
    Date of Patent: July 8, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Engelbert Pechhold, Ivan M. Robinson
  • Polyether urethane polymers prepared from a copolymer of tetrahydrofuran and ethylene oxide
    Patent number: 4120850
    Abstract: A polyether urethane polymer which is the reaction product of(a) a difunctional copolymer of tetrahydrofuran and ethylene oxide or propylene oxide;(b) an organic diisocyanate; and(c) an aliphatic diol of 2 to 10 carbon atoms;Useful as an elastomer.
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: October 17, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Engelbert Pechhold
  • Method of controlling fungi and bacteria in paper products
    Patent number: 3981766
    Abstract: Various substituted cyclohexylamines, e.g., 4-aminodicyclohexylmethane, have demonstrated bacteriostatic and fungistatic properties and can be used as industrial biocides.
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: September 21, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Engelbert Pechhold