Patents by Inventor Robert B. Nilsen

Robert B. Nilsen 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).

  • Retroreflective prism structure with windows formed thereon
    Patent number: 5565151
    Abstract: Retroreflective prisms are formed with windows thereon by removing a portion of the prism mold on one prism pair leaving the apex of the prism intact. In this manner smaller prisms are formed adjacent larger prisms. Optionally, the optical axis of the prisms may be tilted with respect to one another, preferably in a negative direction. The smaller prisms with windows provide increased brightness and optimize the retroreflection light.
    Type: Grant
    Filed: September 28, 1994
    Date of Patent: October 15, 1996
    Assignee: Reflexite Corporation
    Inventor: Robert B. Nilsen
  • Method and apparatus for producing seamless retroreflective sheeting
    Patent number: 5558740
    Abstract: A method and apparatus for forming "seamless" retroreflective sheeting is described. At least two mold surfaces are used, each having alternate areas of arrays of prism recesses and spaces. In a first step, prisms are formed in one of the mold surfaces and applied to a base film or web. Next, prisms are formed on the second mold surface and applied to the spaced areas left in the first step.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: September 24, 1996
    Assignee: Reflexite Corporation
    Inventors: Gus Bernard, Robert B. Nilsen, Michael J. Hanrahan