Patents by Inventor Peter John Cranmer

Peter John Cranmer 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).

  • Method for marking hydrocarbons with substituted anthraquinones
    Patent number: 7915048
    Abstract: A method for marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon at least one substituted anthraquinone dry having formula (I) wherein X is O or S; Y is O, NR7 or S; R1 and R2 independently are hydrogen, alkyl, aryl, aralkyl, heteroalkyl, heterocyclic or alkanoyl; R3 and R5 independently are alkyl, aryl, aralkyl, heteroalkyl or heterocyclic; R4 and R6 independently are hydrogen or alkyl; R7 is hydrogen or alkyl; and wherein the substituted anthraquinone dye(s) has an absorption maximum in the range from 600 nm to 750 nm.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: March 29, 2011
    Assignee: Rohm and Haas Company
    Inventors: David Roderick Baxter, Peter John Cranmer, Kim Sang Ho
  • Method for marking hydrocarbons with substituted anthraquinones
    Publication number: 20040250469
    Abstract: A method for marking a liquid petroleum hydrocarbon.
    Type: Application
    Filed: May 28, 2004
    Publication date: December 16, 2004
    Inventors: David Roderick Baxter, Peter John Cranmer, Kim Sang Ho
  • Method for marking liquid hydrocarbons
    Publication number: 20040106526
    Abstract: A method for marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon: (i) at least one anthraquinone dye having an absorption maximum in the range from 710 nm to 850 nm selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthraquinone dimers; and (ii) at least one visible dye having an absorption maximum in the range from 500 nm to 700 nm.
    Type: Application
    Filed: November 12, 2003
    Publication date: June 3, 2004
    Inventors: David Roderick Baxter, Peter John Cranmer, Kim Sang Ho