Patents by Inventor Ashok K. R. Dewan

Ashok K. R. Dewan 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).

  • Drilling fluids comprising polycyclic polyether polyol
    Patent number: 5248665
    Abstract: Drilling fluid properties are enhanced by incorporation thereinto of a cyclicetherpolyol such as a cyclic dimer of glycerol and, optionally, a polyol such as glycerol or a monoalicyclicpolyol, and/or salt.
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: September 28, 1993
    Assignee: Shell Oil Company
    Inventors: Arthur H. Hale, George C. Blytas, Ashok K. R. Dewan
  • Method for drilling wells
    Patent number: 5083622
    Abstract: Drilling fluid properties are enhanced by incorporation thereinto of a cyclicetherpolyol such as a cyclic dimer of glycerol and, optionally, a polyol such as glycerol or a monoalicyclicpolyol, and/or salt.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: January 28, 1992
    Assignee: Shell Oil Company
    Inventors: Arthur H. Hale, George C. Blytas, Ashok K. R. Dewan
  • Gas hydrate inhibition
    Patent number: 5076364
    Abstract: Gas hydrate formation in a gas well is prevented by injecting a carrier and an alcohol (e.g., glycerol or a glycerol derivative) into the well and connected facilities/pipelines.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: December 31, 1991
    Assignee: Shell Oil Company
    Inventors: Arthur H. Hale, Ashok K. R. Dewan, George C. Blytas
  • Drilling fluids
    Patent number: 5076373
    Abstract: Drilling fluid properties are enhanced by incorporation thereinto of an alcohol such as glycerol, partially hydrolyzed polyacrylamide and, optionally, salt.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: December 31, 1991
    Assignee: Shell Oil Company
    Inventors: Arthur H. Hale, George C. Blytas, Ashok K. R. Dewan