Patents by Inventor Kenneth H. Marshall

Kenneth H. Marshall 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: 4591166
    Abstract: Graphite gaskets with an improved release characteristic are embossed to form a relief pattern of relatively raised areas surrounded by predominantly interconnected depressions, followed by coating with a silicone rubber.
    Type: Grant
    Filed: September 29, 1983
    Date of Patent: May 27, 1986
    Assignee: T & N Materials Research Limited
    Inventors: Alan W. Atkinson, Katryna J. Dearden, Christina Doyle, Janet M. Lancaster, Kenneth H. Marshall, Kay L. Robinson
  • Patent number: 4483675
    Abstract: Method and means for obtaining a dental impression of a reduced tooth for jacket crown, bridgework and like constructions, comprising the use of an impression tube which is substantially inflexible at least longitudinally and which is attached to a syringe for supply of impression material when placed about a tooth and which has a distal end provided with a contour corresponding to the gingival margin at said tooth by the scribing on said tube of a line substantially parallel to the gingival margin, and subsequently removing the end portion of the tube beyond said line.
    Type: Grant
    Filed: December 22, 1982
    Date of Patent: November 20, 1984
    Inventor: Kenneth H. Marshall
  • Patent number: 4255140
    Abstract: Dental impressions are formed without retraction of the gingival tissue by injecting impression material from a syringe having a flexible tubular member positioned over the prepared tooth. The tubular member has a diameter corresponding to the size of the tooth and a tip contoured to the approximate shape of the gingival margin. The tubular member is initially positioned with the contoured tip extending into the gingival sulcus. As the impression material is injected around the tooth the tubular member is slowly withdrawn so that the tooth is fully covered with impression material extending completely into the gingival crevice. A full arch impression tray is then positioned within the mouth of the patient and the impression material allowed to harden.
    Type: Grant
    Filed: June 6, 1979
    Date of Patent: March 10, 1981
    Assignee: Johnson & Johnson Dental Products Company
    Inventor: Kenneth H. Marshall
  • Patent number: 4144645
    Abstract: A method for dentists in the preparation of a patient's tooth for a jacket crown, or for bridgework. It involves the use of a block for firm attachment to the cusp of the tooth, said block having prepared side and end surfaces for guiding a dental handpiece in two parameters.
    Type: Grant
    Filed: November 24, 1976
    Date of Patent: March 20, 1979
    Assignee: Premach Pty. Limited
    Inventor: Kenneth H. Marshall