Patents by Inventor Pen-Chung Wang

Pen-Chung Wang 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).

  • N-(amidoalkyl)hydantoins
    Patent number: 4831161
    Abstract: Prepare N-(amidoalkyl)imides by contacting an imide with a 2-oxazoline under reaction conditions, optionally in the presence of a solvent.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: May 16, 1989
    Assignee: The Dow Chemical Company
    Inventors: Pen-Chung Wang, Steven P. Crain
  • Curable resin compositions
    Patent number: 4749760
    Abstract: This invention relates to a curable resin composition comprising (a) a component selected from the group consisting of a dicyanate-terminated aromatic polysulfone oligomer, a dicyanate-terminated aromatic polyketone oligomer and mixtures thereof, (b) a cyanate ester component selected from the group consisting of polyfunctional aromatic cyanate ester monomers having at least two cyanate groups bonded to their aromatic ring, prepolymers of the cyanate esters and prepolymers of the cyanate ester monomers and amines, and (c) a bismaleimide component selected from the group consisting of bismaleimides, bismaleimides prepolymers and prepolymers of the bismaleimides and amines.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: June 7, 1988
    Assignee: Shell Oil Company
    Inventor: Pen-Chung Wang
  • Selective preparation of N-(amidoalkyl)imides and related compounds
    Patent number: 4692533
    Abstract: Prepare N-(amidoalkyl)imides by contacting an imide with a 2-oxazoline under reaction conditions, optionally in the presence of a solvent.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: September 8, 1987
    Assignee: The Dow Chemical Company
    Inventors: Pen-Chung Wang, Steven P. Crain
  • Polyepoxy aromatic hydantoins
    Patent number: 4672101
    Abstract: A composition comprising a polyepoxy aromatic hydantoin having epoxy functionality on the aromatic and the hydantoin rings.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: June 9, 1987
    Assignee: The Dow Chemical Company
    Inventors: Pen-Chung Wang, Chun S. Wang, Steven P. Crain
  • Process for preparing N-methyl 2- or 4-pyridones
    Patent number: 4656284
    Abstract: Aromatic hydroxyl- or thiol-containing compounds are methylated by contacting with methyl trichloroacetate at elevated temperatures in the presence of an initiator.
    Type: Grant
    Filed: June 2, 1983
    Date of Patent: April 7, 1987
    Assignee: The Dow Chemical Company
    Inventors: James M. Renga, Pen-Chung Wang
  • Process for preparing ethylenically unsaturated heterocyclic thiocarbonyl compounds and their organo-oxylated precursors
    Patent number: 4638064
    Abstract: Unsaturated heterocyclic carbonyl-containing compounds, such as 2-oxathiolone, are prepared by the oxylation of saturated heterocyclic carbonyl-containing precursors of the above compounds in a C.sub.1-4 alcohol or carboxylic acid solvent in the presence of a supporting electrolyte followed by dehydroxylation of the oxylated intermediate.The products formed may be polymerized or copolymerized with other ethylenically unsaturated monomers to prepared resins, films, etc. or they may be employed as reaction intermediates.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: January 20, 1987
    Assignee: The Dow Chemical Company
    Inventors: Pen-Chung Wang, James M. Renga
  • Process for preparing (2,2,2-trihalo-1, 1-dihydrocarbyl-ethoxy) trihydrocarbylsilanes
    Patent number: 4634787
    Abstract: A process for forming trihalomethylsiloxanes by contacting a trihalosilane with a carbonyl in the presence of the fluoride ion. These compounds are used to form .alpha.-substituted acid chlorides.
    Type: Grant
    Filed: November 8, 1985
    Date of Patent: January 6, 1987
    Assignee: The Dow Chemical Company
    Inventor: Pen-Chung Wang
  • Process for preparing methyl ethers or thioethers of aryl compounds
    Patent number: 4595763
    Abstract: Aromatic hydroxyl- or thiol-containing compounds are methylated by contacting with methyl trichloroacetate at elevated temperatures in the presence of an initiator.
    Type: Grant
    Filed: June 27, 1983
    Date of Patent: June 17, 1986
    Assignee: The Dow Chemical Company
    Inventors: James M. Renga, Pen-Chung Wang
  • Preparation of 1,3-bis(aryloxy)-2-propanols
    Patent number: 4584408
    Abstract: Phenoxy resins and other 1,3-bis(aryloxy)-2-propanol compounds are prepared by contacting hydroxy-substituted aromatic compounds with organyl 2-oxo-1,3-dioxolan-4-ylmethyl carbonates.
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: April 22, 1986
    Assignee: The Dow Chemical Company
    Inventors: Pen-Chung Wang, James M. Renga
  • Process for forming esters (I)
    Patent number: 4410718
    Abstract: Carboxylic acid-containing compounds are esterified by reacting at elevated temperatures with organic esters of trichloroacetic acid in the presence of an initiator.
    Type: Grant
    Filed: June 11, 1982
    Date of Patent: October 18, 1983
    Assignee: The Dow Chemical Company
    Inventors: James M. Renga, Pen-Chung Wang
  • Process for forming esters (II)
    Patent number: 4380636
    Abstract: Carboxylic acid-containing compounds are esterified by reacting at elevated temperatures with an organic ester of trichloroacetic acid and an electrophilic halide in the presence of an initiator.
    Type: Grant
    Filed: June 11, 1982
    Date of Patent: April 19, 1983
    Assignee: The Dow Chemical Company
    Inventors: James M. Renga, Pen-Chung Wang
  • Preparation of trichloromethyl carbinols
    Patent number: 4375548
    Abstract: Silylated trichloromethyl carbinol compounds are prepared by contacting aldehydes and ketones with silylated trichloroacetates at elevated temperatures in the presence of an initiator.
    Type: Grant
    Filed: December 17, 1981
    Date of Patent: March 1, 1983
    Assignee: The Dow Chemical Company
    Inventors: Pen-Chung Wang, James M. Renga
  • Silylation of organic compounds
    Patent number: 4360686
    Abstract: Active hydrogen-containing compounds are silylated by contacting with trimethylsilyl trichloroacetate at elevated temperatures in the presence of an initiator.
    Type: Grant
    Filed: September 3, 1981
    Date of Patent: November 23, 1982
    Assignee: The Dow Chemical Company
    Inventors: Pen-Chung Wang, James M. Renga
  • Process for forming ethers
    Patent number: 4349487
    Abstract: Phenolic compounds are etherified by contacting at elevated temperature with a mixture of methyl trichloroacetate and either a primary alkyl halide or an aromatic halide containing strongly electron-withdrawing groups in the presence of an initiator.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: September 14, 1982
    Assignee: The Dow Chemical Company
    Inventors: James M. Renga, Pen-Chung Wang