Patents by Inventor Nadka V. Avramova

Nadka V. Avramova 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).

  • Welded or laminated polyamides
    Patent number: 4980237
    Abstract: Polyamide bodies, e.g., foils or sheets, are welding together or laminated by forming methylene bridges between nitrogen atoms in the separate bodies by pressing them together in the presence of a alkaline paraformaldehyde/methanol solution containing a catalytic amount of oxalic acid.
    Type: Grant
    Filed: December 7, 1989
    Date of Patent: December 25, 1990
    Assignee: University of Delaware
    Inventors: Nadka V. Avramova, Stoyko C. Fakirov, Jerold M. Schultz
  • Process of making a blend of PET and PBT
    Patent number: 4915885
    Abstract: A process of preparing a homogeneous amorphous polymeric blend of polyethyleneterephthalate (PET) and polybutyleneterephthalate (PBT) which includes intimately mixing the PET and PBT at a weight ratio of about 10:90-90:10, melting the mixture at 290.degree.-330.degree. C., cooling the mixture to 0.degree.--194.degree. C. by extruding it onto rollers maintained in a cooling bath and orienting the polymer of the resulting continuous shaped object at room temperature to a draw ratio of about 5:1, with subsequent annealing at about 120.degree.-180.degree. C. for about one hour.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: April 10, 1990
    Assignee: University of Delaware
    Inventors: Nadka V. Avramova, Isak A. Avramov, Stoyko C. Fakirov, Jerold M. Schultz
  • Method for the processing of liquid crystal polymers
    Patent number: 4902369
    Abstract: Described and claimed are a process for preserving the orientation of a liquid crystal polymer/during lamination which comprises carrying out the lamination bonding at a high temperature below the melting point of the polymer and under pressure of up to about 5 MPa.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: February 20, 1990
    Assignee: University of Delaware
    Inventors: Nadka V. Avramova, Stoyko C. Fakirov
  • Method for welding and laminating polyamides
    Patent number: 4895612
    Abstract: Polyamide bodies, e.g., foils or sheets, are welding together or laminated by forming methylene bridges between nitrogen atoms in the separate bodies by pressing them together in the presence of a alkaline paraformaldehyde/methanol solution containing a catalytic amount of oxalic acid.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: January 23, 1990
    Assignee: University of Delaware
    Inventors: Nadka V. Avramova, Stoyko C. Fakirov, Jerold M. Schultz