Patents by Inventor Herman H. Weyland

Herman H. Weyland 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).

  • Catalysts for the oxirane-anhydride reaction
    Patent number: 3977996
    Abstract: This patent describes a method of catalyzing the reaction of organic polybasic acid anhydrides with at least one oxirane which comprises carrying out the reaction in the presence of an effective catalytic amount of a synergistic catalyst mixture comprising an active chromium III tricarboxylate salt having unoccupied coordination sites and any compound capable of polarizing the carboxylic acid anhydride to yield a reactive carboxylic acid moiety.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: August 31, 1976
    Assignee: Aerojet-General Corporation
    Inventors: Arthur Katzakian, Jr., Herman H. Weyland, Roger B. Steele, Marvin H. Gold
  • Catalysts of the oxirane-anhydride reaction
    Patent number: 3978026
    Abstract: This patent describes a method of catalyzing the reaction of organic polybasic acid anhydrides with at least one oxirane which comprises carrying out the reacton in the presence of an effective catalytic amount of a synergistic catalyst mixture comprising an active chromium III tricarboxylate salt haing unoccupied coordination sites and any compound capable of polarizing the carboxlyic acid anhydride to yield a reactive carboxylic acid moiety.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: August 31, 1976
    Assignee: Aerojet-General Corporation
    Inventors: Arthur Katzakian, Jr., Herman H. Weyland, Roger B. Steele, Marvin H. Gold
  • Latent catalysts for epoxy resins
    Patent number: 3956241
    Abstract: Mobile mixtures of an oxirane compound and a labile hydrogen compound such as an acid, anhydride, imide or sulfonimide can be stored at long periods of time under ambient conditions in the presence of a latent chromium III chelate. At an elevated temperature, the catalyst is activated and rapidly converts the mixture into a more advanced state of cure.
    Type: Grant
    Filed: June 7, 1974
    Date of Patent: May 11, 1976
    Assignee: Aerojet-General Corporation
    Inventors: Roger Beresford Steele, Arthur Katzakian, Jr., Herman H. Weyland