Patents by Inventor Chi-Kai Shih

Chi-Kai Shih 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).

  • Method for control of extrusion process
    Patent number: 6627127
    Abstract: Disclosed is a process for controlling extrusion processes by applying dynamic periodic pulses to the process throughout and during the process, analyzing the pulse response data and feeding back the results of the analysis to the process parameters and product properties.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: September 30, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Michael Joseph Piovoso, Paul Thomas Shea, Chi-Kai Shih, Mark David Wetzel
  • Staged feeding process for mixing polymers
    Patent number: 5889112
    Abstract: A staged feeding process for preparing a composition by mixing at least a first polymer and a second, dissimilar polymer forms a final composition comprising a uniform, small-particle dispersion of the first polymer in a matrix of the second polymer. Preferably, the first polymer has a melt viscosity greater than the second polymer. The process comprises the steps of feeding the first polymer in a first feed stage and feeding all of the second polymer as a melt at least two feed stages to mix the first and second polymers. Alternatively, the process may comprise feeding the first polymer in a first feed stage and feeding all of the second polymer in at least two feed stages subsequent to the first feed stage. In either case, this mixing initiates a chemical reaction between the first and second polymers.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: March 30, 1999
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Chi-Kai Shih, Daniel Gregory Tynan, Rita Sue McMinn
  • Elastomeric sol/gel blends
    Patent number: 4520169
    Abstract: The processability of an uncured soft elastomer is improved by blending the elastomer under shear conditions with a terpolymer of ethylene with carbon monoxide and with a copolymerizable ethylenically unsaturated monomer in the presence of a crosslinking agent for polymer (T) which does not substantially cure elastomer (E). Gel resulting from crosslinking polymer (T) improves the properties of the blend as compared with the soft elastomer alone. When elastomer (E) and the crosslinking agent for polymer (T) risk undergoing a reaction which would result in substantially crosslinking elastomer (E), one may substitute another soft elastomer (E.sub.1) for elastomer (E) to avoid this undesirable result and then blend the resulting composition with elastomer (E).
    Type: Grant
    Filed: September 2, 1982
    Date of Patent: May 28, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John F. Hagman, Chi-Kai Shih
  • Blends of copolyesters and ethylene/carboxylic acid copolymers which are at least ten percent neutralized
    Patent number: 4010222
    Abstract: Copolyesters blended with ethylene/carboxylic acid copolymer in which at least 10% of the acid groups are neutralized have increased melt strength, and are more readily processable by blow molding and extrusion film blowing techniques. The blends contain from 0.2 to 20% by weight of the ethylene/acid copolymer.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: March 1, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chi-Kai Shih
  • Blend of ethylene copolymer elastomer and a copolyetherester elastomer
    Patent number: 3963802
    Abstract: An elastomer comprising a blend of (A) an ethylene copolymer and (B) a copolyetherester derived from a dicarboxylic acid, a diol, and a poly(oxyalkylene)glycol.
    Type: Grant
    Filed: June 20, 1975
    Date of Patent: June 15, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chi-Kai Shih