Patents by Inventor Beth E. Dunlap

Beth E. Dunlap 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 from oxydiphthalic anhydride and 2,4-diaminotoluene
    Patent number: 5442031
    Abstract: Soluble polyimides are formed from oxydiphthalic anhydride and 2,4-diaminotoluene. Optionally, up to 30 mole % of an alternate diamine and up to 50 mole % of an alternate dianhydride can be used with the oxydiphthalic anhydride and 2,4-diaminotoluene.
    Type: Grant
    Filed: April 21, 1994
    Date of Patent: August 15, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Beth E. Dunlap
  • Polymer preparation from diacylbis-lactam to avoid crystal formation
    Patent number: 5140096
    Abstract: Premelting of the bis-lactam inhibits crystal formation when reacting certain bis-lactams with certain diamine mixtures.
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: August 18, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Beth E. Dunlap
  • Melt-processible aromatic polyamide from N,N'-isophthaloyl bis lactam
    Patent number: 5136016
    Abstract: Melt-processible aromatic polyamides are obtained by reacting certain N,N'-isophthaloyl bis(lactam) compounds with certain aromatic diamines.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: August 4, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gurdial Singh, Andrew J. Sitter, Beth E. Dunlap, Mark F. Teasley
  • Recovery and melt extrusion of aromatic/aliphatic copolyamides from lactam-plasticized polymer
    Patent number: 5066445
    Abstract: Aromatic/Aliphatic copolyamides are recovered from lactam-plasticized polymer then melted and extruded to form shaped structures.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: November 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Beth E. Dunlap, Fulton F. Rogers, Jr., Mark F. Teasley