Patents by Inventor Reginald T-H. Tang

Reginald T-H. Tang 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).

  • Polycarbonate-based block copolymers and devices
    Patent number: 5531998
    Abstract: This invention relates to a novel polycarbonate-based block polymer, and to fibers and bioresorbable implantable medical devices fabricated from said fibers.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: July 2, 1996
    Assignee: United States Surgical Corporation
    Inventors: Frank Mares, William J. Boyle, Jr., Reginald T.-H. Tang, Kundanbhai M. Patel, Abraham M. Kotliar, Tin-Ho Chiu
  • Medical devices fabricated from homopolymers and copolymers having recurring carbonate units
    Patent number: 5412068
    Abstract: This invention relates to medical devices formed totally or in part from homopolymers or copolymers comprising recurring carbonate moieties.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: May 2, 1995
    Assignee: United States Surgical Corporation
    Inventors: Reginald T.-H. Tang, Frank Mares, William J. Boyle, Jr., Tin-Ho Chiu, Kundanbhai M. Patel
  • Process for preparing graft and block copolymers of polyphenylene oxides and polyesters and copolymers prepared by said process
    Patent number: 5219937
    Abstract: A process of forming block and/or graft copolymers of a polyester and a polyphenylene oxide which comprises heating a mixture of the polyester and the polyphenylene oxide in the presence of a phosphite compound.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: June 15, 1993
    Assignee: AlliedSignal Inc.
    Inventors: Reginald T-H. Tang, Michael C. Bochnik, Frank Mares, Steve Arnold
  • Process for preparing graft and block copolymers of polyphenylene oxides and polyesters and copolymers prepared by said process
    Patent number: 5124411
    Abstract: A process of forming block and/or graft copolymers of a polyester and a polyphenylene oxide which comprises heating a mixture of the polyester and the polyphenylene oxide in the presence of a phosphite compound.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: June 23, 1992
    Assignee: Allied-Signal, Inc.
    Inventors: Reginald T. H. Tang, Michael C. Bochnik, Frank Mares, Steve Arnold
  • Use of silica catalyst for selective production of lactams
    Patent number: 4628085
    Abstract: A process for selective preparation of lactams which comprises contacting, in the vapor phase, an aliphatic or aromatic aminonitrile having the formula HR.sub.1 N--D--CN wherein D is a divalent organic moiety and wherein R.sub.1 is (C.sub.1 -C.sub.4) alkyl or hydrogen with an effective amount of a silica catalyst, in the form of substantially spherical beads having a BET surface area greater than about 250 m.sup.2 /g, preferably between 300 and 500 m.sup.2 /g, and an average pore diameter less than about 20 nanometers preferably 8-10 nanometers at a temperature in the range of about 200.degree. to about 400.degree. C. and at a hydrogen or inert gas flow with a pressure in the range of about 0 to about 300 kPa, in the presence of: (a) ammonia in an amount equal to from 0 to about 50 mole percent of the molar amount of aliphatic or aromatic aminonitrile present; and (b) water in an amount from at least about 1.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: December 9, 1986
    Assignee: Allied Corporation
    Inventors: Frank Mares, Reginald T-H. Tang, James E. Galle, Rose M. Federici