Patents by Inventor T. Ian Bradshaw

T. Ian Bradshaw 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).

  • Wet retroreflective marking material
    Patent number: 6703108
    Abstract: Retroreflective pavement marking material comprising on the top surface thereof an enclosed-lens retroreflective sheet that comprises a monolayer of retroreflective elements wherein first portions of the monolayer are arranged in an upwardly contoured profile and second portions of the monolayer are arranged a lower, substantially planar position.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: March 9, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Chester A. Bacon, Jr., Louis C. Belisle, Larry K. Stump, Terry R. Bailey, T. Ian Bradshaw, Dale H. Haunschild, Gregory F. Jacobs
  • Method of making wet retroreflective marking material
    Patent number: 6127020
    Abstract: A method of making a retroreflective marking material is provided, the method has the steps of: (a) providing an enclosed-lens retroreflective sheet having a top surface and a bottom surface and comprising a cover layer and a monolayer of retroreflective elements; (b) applying a conformance layer to the bottom surface of the retroreflective sheet; and (c) laminating a configuration member to the conformance layer thereby creating first portions and second portions in the sheet, the first portions being arranged in an upwardly contoured profile and the second portions being arranged in a lower, substantially planar position. A retroreflective article made by the method is also provided.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: October 3, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Chester A. Bacon, Jr., Louis C. Belisle, deceased, Larry K. Stump, Terry R. Bailey, T. Ian Bradshaw, Dale H. Haunschild, Gregory F. Jacobs
  • Patterned pavement markings with upright retroreflectors
    Patent number: 5683746
    Abstract: An improved pavement marking sheet material, and a method for making such pavement marking sheet material. The pavement marking sheet material comprises a selected configuration of upright retroreflectors. The upright retroreflectors are arranged in a selected configuration so as to maximize reflectivity as measured at actual observation geometries by allowing light to be incident to effective portions of the retroreflective elements on the upright retroreflectors.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: November 4, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Thomas P. Hedblom, T. Ian Bradshaw
  • Patterned pavement markings with upright retroreflectors
    Patent number: 5670227
    Abstract: An improved pavement marking sheet material, and a method for making such pavement marking sheet material. The pavement marking sheet material comprises a selected configuration of upright retroreflectors. The upright retroreflectors are arranged in a selected configuration so as to maximize reflectivity as measured at actual observation geometries by allowing light to be incident to effective portions of the retroreflective elements on the upright retroreflectors.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: September 23, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Thomas P. Hedblom, T. Ian Bradshaw