Patents by Inventor John Frederik Knifton

John Frederik Knifton 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).

  • Diaminoalkane syntheses via selective amination of dihydric alcohols
    Patent number: 6191310
    Abstract: Disclosed is a process for selectively producing diaminoalkanes which comprises reacting a dihydric alcohol characterized by two to six carbons, preferably 1,3-propanediol, with excess ammonia and sufficient hydrogen to stabilize a nickel or cobalt-containing hydroamination catalyst, at a temperature of at least 150° C. and a pressure of at least 500 psig, until there is substantial formation of the desired diaminoalkane, wherein said catalyst comprises at least one metal selected from the group consisting of nickel and cobalt, or mixtures thereof, optionally in the presence of one or more promoters, but particularly molybdenum oxide.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: February 20, 2001
    Assignee: Shell Oil Company
    Inventors: John Frederik Knifton, Daniel John Janitor
  • Diaminoalkane syntheses via selective amination of hydroxyaldehydes
    Patent number: 6147261
    Abstract: Disclosed is a process for producing diaminoalkanes which comprises reacting a hydroxyalkanal characterized by two to six carbons, preferably 3-hydroxypropanal, with excess ammonia and sufficient hydrogen to stabilize a nickel or cobalt-containing hydroamination catalyst, at a temperature of at least 50.degree. C. and a pressure of at least 500 psig, until there is substantial formation of the desired diaminoalkane, wherein said catalyst comprises at least one metal selected from the group consisting of nickel and cobalt, or mixtures thereof, optionally in the presence of one or more promoters.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: November 14, 2000
    Assignee: Shell Oil Corporation
    Inventors: John Frederik Knifton, Daniel John Janitor