Patents Assigned to Barcroft Company
  • Low viscosity aluminum hydroxy carbonate gel process
    Patent number: 4622167
    Abstract: Process and system for the preparation of a low viscosity Aluminum Hydroxy Carbonate Gel having viscosity-resistant properties and a predetermined alkali ion content, comprising reacting under constant pH conditions an aqueous carbonate solution and an aqueous aluminum salt solution to form a reaction product, equilibrating the reaction product at naturally occurring pH and washing the equilibrated reaction product to provide the predetermined alkali ion content and the gel product by same processes.
    Type: Grant
    Filed: December 27, 1984
    Date of Patent: November 11, 1986
    Assignee: Barcroft Company
    Inventors: Wilbur G. Heath, Robert B. Casey
  • Process for producing pharmaceutical grade aluminum hydroxide gels
    Patent number: 4105579
    Abstract: A process for producing aluminum hydroxide gels substantially free of sodium ions involves a heterogeneous reaction between an aqueous solution of a water soluble aluminum salt and an aqueous slurry of a water soluble alkaline earth carbonate.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: August 8, 1978
    Assignee: Barcroft Company
    Inventor: Green B. Glasscock