Patents by Inventor Deborah Ann Snell Tung

Deborah Ann Snell Tung 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).

  • Compositions of polycondensed branched polyester polymers and aromatic polycarbonates, and the closed cell polymer foams made therefrom
    Patent number: 6214897
    Abstract: A foamable polyester composition comprising a combination of blowing agent and mixed polymer composition comprising: a) a semi-crystalline polyester composition comprising a polycondensed branched polyester polymer, and b) an aromatic polycarbonate polymer. The foamable composition has a high extrusion melt strength, and can pulled across a die without ripping, to form a continuous thermoformable closed cell polyester sheet. The foamed sheets have a uniform, fine, and closed cell morphology; and simultaneously are less dense but have a higher impact strength than comparable closed cell polymers made in only with linear polyesters as the polyester component or without the aromatic polycarbonate.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: April 10, 2001
    Assignee: Shell Oil Company
    Inventors: Deborah Ann Snell Tung, Kevin Rollick, John Michael Scoarste, Walter Francis Johnston
  • Process to prepare a polyester resin
    Patent number: 6113997
    Abstract: A process is disclosed to prepare a polyester resin having a predetermined acetaldehyde (AA) content whereby the IV of the melt phase resin is constrained to a certain range resulting in a longer SSP time to achieve a higher level of IV for the resin with an AA content of 1 PPM or less. The resultant resin can be transformed into a bottle preform, which, when blown, forms a bottle suitable for packaging of mineral water.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: September 5, 2000
    Assignee: Shell Oil Company
    Inventors: Freddie Lee Massey, Deborah Ann Snell Tung, Millicent Louise Martin-Shultz, Ben Duh, Charles Louis Kern, Jr.
  • Compositions of polycondensed branched polyester polymers and aromatic polycarbonates, and the closed cell polymer foams made therefrom
    Patent number: 6100307
    Abstract: A foamable polyester composition comprising a combination of blowing agent and mixed polymer composition comprising:a) a semi-crystalline polyester composition comprising a polycondensed branched polyester polymer, andb) an aromatic polycarbonate polymer.The foamable composition has a high extrusion melt strength, and can pulled across a die without ripping, to form a continuous thermoformable closed cell polyester sheet. The foamed sheets have a uniform, fine, and closed cell morphology; and simultaneously are less dense but have a higher impact strength than comparable closed cell polymers made in only with linear polyesters as the polyester component or without the aromatic polycarbonate.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: August 8, 2000
    Assignee: Shell Oil Company
    Inventors: Deborah Ann Snell Tung, Kevin Rollick, John Michael Scoarste, Walter Francis Johnston
  • Compositions of polycondensed branched polyester polymers and aromatic polycarbonates, and the closed cell polymer foams made therefrom
    Patent number: 6080824
    Abstract: A foamable polyester composition comprising a combination of blowing agent and mixed polymer composition comprising:a) a semi-crystalline polyester composition comprising a polycondensed branched polyester polymer, andb) an aromatic polycarbonate polymer.The foamable composition has a high extrusion melt strength, and can pulled across a die without ripping, to form a continuous thermoformable closed cell polyester sheet. The foamed sheets have a uniform, fine, and closed cell morphology; and simultaneously are less dense but have a higher impact strength than comparable closed cell polymers made in only with linear polyesters as the polyester component or without the aromatic polycarbonate.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: June 27, 2000
    Assignee: Shell Oil Company
    Inventors: Deborah Ann Snell Tung, Kevin Rollick, John Michael Scoarste, Walter Francis Johnston
  • Compositions of polycondensed branched polyester polymers and aromatic polycarbonates, and the closed cell polymer foams made therefrom
    Patent number: 6025405
    Abstract: A foamable polyester composition comprising a combination of blowing agent and mixed polymer composition comprising:a) a semi-crystalline polyester composition comprising a polycondensed branched polyester polymer, andb) an aromatic polycarbonate polymer.The foamable composition has a high extrusion melt strength, and can pulled across a die without ripping, to form a continuous thermoformable closed cell polyester sheet. The foamed sheets have a uniform, fine, and closed cell morphology; and simultaneously are less dense but have a higher impact strength than comparable closed cell polymers made in only with linear polyesters as the polyester component or without the aromatic polycarbonate.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: February 15, 2000
    Assignee: Shell Oil Company
    Inventors: Deborah Ann Snell Tung, Kevin Rollick, John Michael Scoarste, Walter Francis Johnston
  • Glass fiber filled polyester polymers
    Patent number: 5780539
    Abstract: A polyester polymer containing micro glass fibers having an aspect ratio of greater than 1000, preferably from about 2000 to about 5000. Those micro glass fibers having these aspect ratios, preferably with mean fiber diameters of 1 microns or less, act as excellent nucleating agents to promote crystallization of the polymer melt during its cooling phase, improve the rheological behavior of the melt, reduce the crystalline half time during cooling phases, and are acceptable in polyester molded or thermoformed products which come into contact with food or beverage.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: July 14, 1998
    Assignee: Shell Oil Company
    Inventor: Deborah Ann Snell Tung