Patents by Inventor John R. Kirwan, Jr.

John R. Kirwan, 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).

  • Semipermeable membrane cartridge for use with a pressure container
    Patent number: 4548714
    Abstract: An improvement in a membrane cartridge for insertion into a pressure-resistant container and having a central passageway holding a permeate collection tube. A cartridge is formed, at least in part, by a spiral winding of a laminate leaf comprising semipermeable membrane sheet material, permeate transfer sheet material, and porous grid sheet material. An extension on the leaf of the porous grid material is of sufficient length to encompass the circumference of the cartridge when the cartridge is positioned inside the container. The cartridge may have an outer wrapping of water-soluble sheet material.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: October 22, 1985
    Assignee: Desalination Systems, Inc.
    Inventors: John R. Kirwan, Jr., Donald T. Bray