Patents by Inventor David W. H. Roth, Jr.

David W. H. Roth, Jr. 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 production of multicyanate esters
    Patent number: 5648435
    Abstract: A process of preparing multicyanate esters by: a) reacting an adduct of a tertiary amine and a phenol-formaldehyde oligomer or derivative thereof with cyanogen halide in a solvent reaction medium under conditions to form a reaction product stream containing at least one of the following compounds selected from the group consisting of tertiary amine-hydrohalide salt, solvent, and impurities, and, based upon the total weight of the reaction product stream excluding the weight of said tertiary amine-hydrohalide salt, from about 10 percent to about 40 percent of a multicyanate ester; b) recycling a portion of said reaction product stream into the mixture of step a; and c) separating and recovering said solvent and tertiary amine from said reaction product stream. The multicyanate ester products produced are useful as bonding agents in friction materials, molding materials, coatings, and adhesives.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: July 15, 1997
    Assignee: AlliedSignal Inc.
    Inventors: David W. H. Roth, Jr., Sajal Das
  • Process for production of multicyanate esters
    Patent number: 5504186
    Abstract: The present invention is directed to a process of preparing multicyanate esters by: a) reacting an adduct of a tertiary amine and a phenol-formaldehyde oligomer or derivative thereof with cyanogen halide in a solvent reaction medium under conditions to form a reaction product stream containing at least one of the following compounds selected from the group consisting of tertiary amine-hydrohalide salt, solvent, and impurities, and, based upon the total weight of the reaction product stream excluding the weight of said tertiary amine-hydrohalide salt, from about 10 percent to about 40 percent of a multicyanate ester; b) recycling a portion of said reaction product stream into the mixture of step a; and c) separating and recovering said solvent and tertiary amine from said reaction product stream.The multicyanate ester products produced according to the present invention are useful as bonding agents in friction materials, molding materials, coatings, and adhesives.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 2, 1996
    Assignee: AlliedSignal Inc.
    Inventors: David W. H. Roth, Jr., Sajal Das
  • Process for production of multicyanate esters
    Patent number: 5483013
    Abstract: The present invention is directed to a process of preparing multicyanate esters by: a) reacting an adduct of a tertiary amine and a phenol-formaldehyde oligomer or derivative thereof with cyanogen halide in a solvent reaction medium under conditions to form a reaction product stream containing at least one of the following compounds selected from the group consisting of tertiary amine-hydrohalide salt, solvent, and impurities, and, based upon the total weight of the reaction product stream excluding the weight of said tertiary amine-hydrohalide salt, from about 10 percent to about 40 percent of a multicyanate ester; b) recycling a portion of said reaction product stream into the mixture of step a; and c) separating and recovering said solvent and tertiary amine from said reaction product stream.The multicyanate ester products produced according to the present invention are useful as bonding agents in friction materials, molding materials, coatings, and adhesives.
    Type: Grant
    Filed: January 27, 1995
    Date of Patent: January 9, 1996
    Assignee: AlliedSignal Inc.
    Inventors: David W. H. Roth, Jr., Sajal Das
  • Chemically homogeneous microcrystalline metal powder for coating substrates
    Patent number: 4381943
    Abstract: The present invention is a chemically homogeneous microcrystalline powder for deposition onto a substrate. The powder is a B containing alloy based in Fe, Ni, Co or a combination thereof.
    Type: Grant
    Filed: July 22, 1981
    Date of Patent: May 3, 1983
    Assignee: Allied Corporation
    Inventors: James Dickson, Louis F. Nienart, David W. H. Roth, Jr.
  • Extractive distillation for separating ketones and/or alcohols from phenol and/or cresol
    Patent number: 4187152
    Abstract: An extractive distillation process for separating one or more members of the group consisting of alkanols, alkanones, cycloalkanols and/or cycloalkanones from mixtures with phenol and/or cresol. One or more members of the group consisting of alkylated or unmodified cycloalkyl or aryl-derivatives of cyclohexanone or cyclohexanol having up to about 22 carbon atoms are employed as extractive solvent.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: February 5, 1980
    Assignee: Allied Chemical Corporation
    Inventors: David W. H. Roth, Jr., David Zudkevitch