Patents by Inventor James H. C. Harper

James H. C. Harper 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: 5981033
    Abstract: A pavement marking tape having a scrim, wherein the scrim is extensible to enable the tape to conform to irregularities in a road surface, and thereby bond more securely to that surface.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: November 9, 1999
    Assignee: 3M Innovative Properties Company
    Inventors: Dale H. Haunschild, Neil A. Hodson, Warren J. Johnson, Terrence W. Miller, Larry K. Stump, James H. C. Harper, Roberta M. Collins Harper
  • Patent number: 5759928
    Abstract: A pavement marking material comprises a flexible base sheet that is conformable to an irregular pavement surface. A non-continuous, durable, wear-resistant polymeric top layer is adhered to one surface of the base sheet. The discontinuous nature of the polymeric top layer provides for increased initial conformance of the pavement marking to irregular pavement surfaces. The discontinuous nature of the polymeric top layer also reduces elastic tensile stresses which tend to build up in continuous top layers and cause adhesive failure. A plurality of particles, retroreflective microspheres and/or skid-resistant particles, are embedded in and protrude from the non-continuous top layer.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: June 2, 1998
    Assignee: Minneota Mining and Manufacturing Company
    Inventor: James H. C. Harper
  • Patent number: 5453320
    Abstract: Pavement marking material comprising a top layer, an optional base sheet, and a layer of adhesive, wherein the adhesive comprises a rubber and a high loading of tackifier. Such adhesives have been found to exhibit exceptional impact shear resistance.
    Type: Grant
    Filed: November 16, 1993
    Date of Patent: September 26, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: James H. C. Harper, Gary R. Miron, Timothy D. Bredhal
  • Patent number: 5077117
    Abstract: A pavement marking material comprises a flexible base sheet that is conformable to an irregular pavement surface. A durable, wear-resistant, polymeric top layer is adhered to one surface of the base sheet. The top layer is capable of undergoing brittle fracture at a temperature from 0.degree. C. to 45.degree. C. such that when the base sheet conforms an irregular surface, the top layer readily forms ruptures to relieve stress build-up in the top layer as the regions of the top layer defined by the ruptures remain adhered to, and follow the conformance of, the base sheet. A plurality of particles are embedded in and protrude from the top layer. The particles comprise retroreflective beads and skid-resistant granules. In a preferred embodiment, the top layer is characterized by a Young's modulus of from about 50,000 psi to about 300,000 psi, and a percent elongation at break of from about 4% to about 35%.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: December 31, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: James H. C. Harper, Raymond E. Grunzinger, Jr.
  • Patent number: 4901738
    Abstract: A laser shield is constructed from a non-linting fabric sheet and a metal layer. The shield can be used as a laser-resistant surgical drape during laser surgery to protect the patient from aberrant laser strikes. The laser shield resists penetration by commonly-used surgical lasers, is non-reflective and flame resistant, and provides ready detection of any laser beam which strikes it.
    Type: Grant
    Filed: December 13, 1988
    Date of Patent: February 20, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert H. Brink, James H. C. Harper, Steven T. Link