Patents by Inventor Isadore Swerlick

Isadore Swerlick 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).

  • Casting films of polymers of meta-phenylene isophthalamide
    Patent number: 4378326
    Abstract: Film of a wholly aromatic polyamide, at least 85% of the repeating units of which are meta-phenylene isophthalamide units, which is undrawn and noncrystalline and which has improved impact strength. Such film is made by heat-treating film of the polyamide which is undrawn and noncrystalline at 400.degree. to 300.degree. C. for from 2 seconds to 2 minutes while maintaining the film at constant length and width permitting it to shrink by at most 20% in each of the length and width.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: March 29, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William D. Garlington, Isadore Swerlick
  • Film of aromatic polyamide and process therefor
    Patent number: 4346215
    Abstract: Film of a wholly aromatic polyamide, at least 85% of the repeating units of which are meta-phenylene isophthalamide units, which is undrawn and noncrystalline and which has improved impact strength. Such film is made by heat-treating film of the polyamide which is undrawn and noncrystalline at 400.degree. to 300.degree. C. for from 2 seconds to 2 minutes while maintaining the film at constant length and width or while permitting it to shrink by at most 20% in each of the length and width.
    Type: Grant
    Filed: July 17, 1981
    Date of Patent: August 24, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William D. Garlington, Isadore Swerlick
  • Fluoropolymer hexafluoropropene, tetrafluorethene and 1,1-difluoroethene
    Patent number: 4335238
    Abstract: Terpolymer consisting of 12 to 48% by weight TFE units, 7 to 24% by weight HFP units and 30 to 81% by weight VF.sub.2 units, provided that when the content of TFE units is less than 42% by weight, the content of HFP units is less than 15% by weight. Heat-stable films such as polyimide film can be coated with a coating comprising the terpolymer to provide heat-sealable film useful as wire insulation.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: June 15, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert L. Moore, Clare A. Stewart, Jr., Isadore Swerlick
  • Coated, heat-sealable aromatic polymer film
    Patent number: 4329399
    Abstract: Coated film having a base layer of an aromatic polymer such as polyimide, polyamide, polyamide-imide, or polyparabanic acid, and having on at least one side thereof a thermally stable, heat-sealable coating comprising a TFE:HFP:VF.sub.2 terpolymer of selected composition. The coated film is useful as wire insulation.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: May 11, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Isadore Swerlick
  • Process for preparing high barrier, heat-sealable packaging film
    Patent number: 3959526
    Abstract: An improvement in a process for preparing a high barrier, heat-sealable packaging material. A flexible base sheet carrying at least a one side copolymer high barrier coating applied from a solvent solution receives a second copolymer coating having optimum heat sealing properties from a dilute solvent coating system thereby yielding, when finally dried, a double copolymer distribution on the base sheet surface having a low level of total retained solvents, particularly high boiling point solvents.
    Type: Grant
    Filed: December 20, 1974
    Date of Patent: May 25, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Isadore Swerlick