Patents by Inventor Herbert S. Chao

Herbert S. Chao 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).

  • Process for preparing sulfonated poly(aryl ether) resins
    Patent number: 4625000
    Abstract: Poly(aryl ether) resins having repeat units of the structure--O--E--O--E'--wherein E is the residuum of a dihydric phenol and E' is the residuum of a benzenoid compound having an inert electron withdrawing group in at least one of the positions ortho and para to the valence bonds, can be sulfonated by first reacting with a silyl halosulfonate, or the combination of a silyl halide and a halosulfonic acid, to form a resin having pendant silyl sulfonate groups, followed by the base cleavage of the silyl moiety to form the sulfonated resin. The sulfonated resins may be used to make membranes.
    Type: Grant
    Filed: June 12, 1985
    Date of Patent: November 25, 1986
    Assignee: Union Carbide Corporation
    Inventors: Herbert S. Chao, Donald R. Kelsey
  • Silicon-lactam blends and products obtained therefrom
    Patent number: 4603177
    Abstract: Crosslinkable polyamide blends are provided of lactam, a silicon substituted lactam and a base polymerization catalyst. The crosslinkable blends can be reinforced and converted to polyamide parts by standard molding techniques.
    Type: Grant
    Filed: February 27, 1985
    Date of Patent: July 29, 1986
    Assignee: General Electric Company
    Inventors: Peter P. Policastro, Herbert S. Chao
  • Circuit board substrates prepared from poly(aryl ethers)s
    Patent number: 4550140
    Abstract: Circuit board substrates prepared from poly(aryl ether)s which contain repeating units derived from bis-(3,5-dimethyl-4-hydroxyphenyl) sulfone (TMBS) exhibit adequate glass transition temperatures (Tg), acceptable plateability and acceptable resistance to water absorption.
    Type: Grant
    Filed: March 20, 1984
    Date of Patent: October 29, 1985
    Assignee: Union Carbide Corporation
    Inventors: Stephen B. Rimsa, James E. Harris, Herbert S. Chao, Louis M. Maresca
  • Poly (aryl ether)s
    Patent number: 4473684
    Abstract: Poly(aryl ether)s which contain at least 20% by weight of bis-(3,5-dimethyl-4-oxyphenyl)sulfone structural units exhibit improved glass transition temperatures, improved flame resistance, improved gas permeability and improved alloying compatibility.
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: September 25, 1984
    Assignee: Union Carbide Corporation
    Inventors: Louis M. Maresca, Herbert S. Chao