Patents by Inventor Murty S. Tanikella

Murty S. Tanikella 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).

  • Polyimides having high Tg, high TOS, and low moisture regain
    Patent number: 6127509
    Abstract: Polyimide polymers from 3,4,3',4'-biphenyltetracarboxylic dianhydride and 3,4,3',4'-benzophenonetetracarboxylic dianhydride and a diamine such as p-phenylenediamine exhibit a high glass transition temperature, high thermal oxidative stability and low moisture regain, useful for structural applications.
    Type: Grant
    Filed: June 1, 1999
    Date of Patent: October 3, 2000
    Assignees: E. I. du Pont de Nemours and Company, Fiberite Inc.
    Inventors: James F. Pratte, Murty S. Tanikella
  • Melt-processible polyimides with high Tg
    Patent number: 5478913
    Abstract: Copolyimides from 1,4-bis(4-aminophenoxy)-2-phenylbenzene and m- or p-phenylene diamine with biphenyl dianhydride exhibit a high Tg and reduced melt viscosity.
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: December 26, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard J. Boyce, Thomas P. Gannett, James M. Sonnett, Murty S. Tanikella, Brian C. Auman
  • Process of producing substantially void-free polyimide composites
    Patent number: 5300176
    Abstract: Presence of small amounts of certain strongly basic amines in polymerization mixture during composite formation results in void reduction.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: April 5, 1994
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Murty S. Tanikella
  • Acid-dyeable fibers of polyester modified with tetramethylpiperidine polyether glycols
    Patent number: 4001190
    Abstract: Textile fibers or filaments having improved dyeability are prepared from linear polyesters modified with a minor proportion of 2,2,6,6,-tetramethylpiperidine groups attached in the polymer chain through oxyalkylene linkages at the 1 and 4 positions of the piperidine ring. Alkylene oxide condensates of 2,2,6,6,-tetramethylpiperidine glycols are shown to have adequate heat-stability and compatibility for incorporating in polyesters under conditions of condensation polymerization to form modified polyesters suitable for melt-spinning into desirable products.
    Type: Grant
    Filed: March 19, 1975
    Date of Patent: January 4, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Murty S. Tanikella, Odorich VON Susani
  • Fibers of acid-dyeable polyester having tetramethylpiperidine groups attached through oxyalkalene linkages to ends of polymer chains
    Patent number: 4001189
    Abstract: Textile fibers or filaments prepared from polyesters modified with a minor proportion of 2,2,6,6-tetramethylpiperidine groups attached through oxyalkylene linkages to ends of linear polyester polymer chains have improved dyeability with acid dyes. A variety of alkylene oxide condensates of tetramethylpiperidine compounds are shown to have adequate heat-stability and compatibility for incorporating in polyesters under conditions of condensation polymerization to form desirable products.
    Type: Grant
    Filed: March 19, 1975
    Date of Patent: January 4, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Murty S. Tanikella, Odorich VON Susani
  • Alkylene oxide condensates of tetramethylpiperidine alcohols or glycols
    Patent number: 3974127
    Abstract: Alkylene oxide condensates obtained by reacting ethylene oxide and/or propylene oxide with a monohydric 2,2,6,6-tetramethylpiperidine alcohol or a tetramethylpiperidine glycol are useful for introducing basic groups in synthetic polymers. Examples illustrate preparation of a variety of such alkylene oxide condensates which are particularly useful in polyester filaments for imparting acid-dyeability.
    Type: Grant
    Filed: September 17, 1974
    Date of Patent: August 10, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Murty S. Tanikella, Odorich Von Susani