Patents by Inventor R. John Whitaker

R. John Whitaker 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).

  • Patent number: 4950752
    Abstract: A method is provided for obtaining concentrated solutions of mucilaginous material by heating plants in an aqueous alkaline medium to form a mixture of solid and liquid, then rapidly expressing the liquid from a thin layer of plant in the apparatus. Apparatus for successively expressing liquid from batches of liquid-solid mixture, said apparatus including a porous septum at the open face of a chamber, the chamber being intermittently sealed to the septum, and having a piston to press the mixture against the septum to express liquid through the septum, the solid residue from each batch being conveyed beyond the unsealed chamber as the next batch is being conveyed into it.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: August 21, 1990
    Assignee: Carratech, Inc.
    Inventor: R. John Whitaker
  • Patent number: 4816573
    Abstract: Sea plants containing kappa carrageenan are separated from those containing lambda carrageenan by subjecting a mixture of such plants to preferential hydration of the lambda plants without substantial dissolution of carrageenan, and separating it from the kappa plants by selection based on water content or on properties related to or dependent on water content.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: March 28, 1989
    Assignee: Prince Edward Island Development Agency
    Inventor: R. John Whitaker
  • Patent number: 4765886
    Abstract: A mixture of sea plants, some of which have compacted sticky characteristics and others of which exhibit hard incompactible fronded characteristics is separated into its components by pressing against a perforated surface to extrude the compacted sticky material through the perforations.
    Type: Grant
    Filed: May 13, 1986
    Date of Patent: August 23, 1988
    Assignee: Carratech, Inc.
    Inventor: R. John Whitaker