Patents by Inventor Seshadri Ramachandran

Seshadri Ramachandran 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).

  • Chitosan-coated pulp a paper using the pulp, and a process for making them
    Patent number: 6139688
    Abstract: A coated aramid fiber is disclosed wherein the coating is a small amount of chitosan and the coated fiber is useful in manufacture of an improved friction paper. An improved friction paper is, also, disclosed wherein chitosan is present throughout the paper as a coating on all components.
    Type: Grant
    Filed: October 5, 1999
    Date of Patent: October 31, 2000
    Assignee: E. I. duPont de Nemours and Company
    Inventor: Seshadri Ramachandran
  • Chitosan-coated pulp, a paper using the pulp, and a process for making them
    Patent number: 5998026
    Abstract: A coated aramid fiber is disclosed wherein the coating is a small amount of chitosan and the coated fiber is useful in manufacture of an improved friction paper. An improved friction paper is, also, disclosed wherein chitosan is present throughout the paper as a coating on all components.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: December 7, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Seshadri Ramachandran
  • Viscous liquid applicator method
    Patent number: 5976631
    Abstract: A method for applying to a surface a viscous liquid having a low shear rate viscosity in the range from about 0.1 Pascal.seconds to about ten (10) Pascal.seconds at a shear rate of ten (10) per second, a shear-thinning power law index in the range from about 0.2 to about 0.6, a high shear rate viscosity in the range from about 0.05 Pascal.seconds to about 0.5 Pascal.seconds at a shear rate of twenty thousand (20,000) per second, and a surface tension in the range from about fifteen (15) dynes/cm. to about sixty (60) dynes/cm. is characterized by pressurizing the liquid to a static pressure in the range from about five hundred (500) pounds per square inch to about fourteen hundred (1400) pounds per square inch, and thereafter spraying the viscous liquid at a dynamic pressure in the range from about one hundred (100) pounds per square inch to about one thousand (1000) pounds per square inch, whereby the liquid emanates as a spray with substantially no mist through a spray tip of an applicator wand.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: November 2, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Seshadri Ramachandran
  • Aramid dispersions and aramid sheets of increased uniformity
    Patent number: 5833807
    Abstract: A process is disclosed for making aqueous aramid dispersion and aramid sheets of improved uniformity by utilizing water with a pH of greater than 10.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: November 10, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Seshadri Ramachandran, Ronnie Aaron Allen
  • Chitosan-coated pulp, a paper using the pulp, and a process for making them
    Patent number: 5827610
    Abstract: A coated aramid fiber is disclosed wherein the coating is a small amount of chitosan and the coated fiber is useful in manufacture of an improved friction paper. An improved friction paper is, also, disclosed wherein chitosan is present throughout the paper as a coating on all components.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: October 27, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Seshadri Ramachandran
  • Hafnia modified alumina fibers
    Patent number: 4921819
    Abstract: Alumina fibers which incorporate hafnia and optionally zirconia plus a fourth oxide exhibit surprising grain refinement on sintering, and thereafter excellent retention of strength after exposure to high temperatures.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: May 1, 1990
    Assignee: E. I. Dupont de Nemours and Company
    Inventor: Seshadri Ramachandran