Patents by Inventor James A. Stead

James A. Stead 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).

  • Controlled release means
    Patent number: 4975284
    Abstract: A controlled release means comprisng a core of at least one water-soluble ingredient of which at least one ingredient is to be released in a controlled manner, said core being surrounded by a semi-permeable membrane coating containing dispersed water-soluble pore-forming particles in sufficient amount to give rise to dissolution upon exposure to an aqueous environment to form only one or two pores extending through the coating to provide communication between the core and the exterior of the coating and a method of making the same.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: December 4, 1990
    Assignee: Roussel Uclaf
    Inventors: James A. Stead, Shore Nabahi