Patents by Inventor Ravanasamudram V. Subramanian

Ravanasamudram V. Subramanian 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).

  • Treatment of carbon fibers to decrease electrical hazards of conductive fiber fragment release
    Patent number: 4272346
    Abstract: Carbon fibers are electrocoated by electrodeposition or electropolymerization to facilitate the formation of char, a nonconductive residue or fiber clumps when the coated fibers within a composite are subsequently exposed to fire. Coating materials or precursors are phosphorus compounds, titanates, polyimides, polyquinoxalines, nitriles, or boric acid.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: June 9, 1981
    Assignee: Washington State University Research Foundation
    Inventors: James J. Jakubowski, Ravanasamudram V. Subramanian
  • Method for forming basalt fibers with improved tensile strength
    Patent number: 4149866
    Abstract: A method of improving the tensile strength of drawn fibers produced from molten basalt rock. Strength is increased by reducing the ferric iron content of the final fibers below that which would be present in the fibers if drawn under normal atmospheric and operational conditions. This is accomplished by either adding a reducing agent to the melt, by drawing the fibers in an inert or reducing atmosphere, or by a combination of both methods.
    Type: Grant
    Filed: March 9, 1978
    Date of Patent: April 17, 1979
    Assignee: Washington State University Research Foundation
    Inventors: Helen F. Austin, Ravanasamudram V. Subramanian