Patents by Inventor Erik K. Nelson

Erik K. Nelson 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).

  • Method for cutting imaging sheets containing photosensitive microcapsules
    Patent number: 4613742
    Abstract: A method and apparatus for cutting imaging sheets including a layer of photohardenable microcapsules without discoloring along the cut edge wherein the line along which the sheet is to be cut is exposed to actinic radiation.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: September 23, 1986
    Assignee: The Mead Corporation
    Inventors: Erik K. Nelson, Donald L. Head
  • Magnetic brush abrasion development of imaging sheets employing photosensitive microcapsules
    Patent number: 4592986
    Abstract: Imaging sheets having a coating containing chromogenic material and a photosensitive composition with at least the photosensitive composition encapsulated in rupturable microcapsules as an internal phase are processed by contacting the imaging sheets with a traveling pile formed by magnetically attractable free particles on a magnetic brush to rupture the microcapsules coating the surfaces of the imaging sheets by means of a soft pliable brushing action of the pile against the imaging sheets.
    Type: Grant
    Filed: March 14, 1985
    Date of Patent: June 3, 1986
    Assignee: The Mead Corporation
    Inventors: Erik K. Nelson, Joseph G. O'Connor, David A. Boyer, Edward J. Saccocio
  • Half tone screen exposure apparatus
    Patent number: 4466735
    Abstract: A half tone screen of a graphic camera is uniformly exposed by a pinhole light projector positioned off axis with respect to the main optical projection axis. A light diffuser is positioned intermediate a light source and the pinhole has a variable density light attenuator pattern consisting of a plurality of circular lines for attenuating the light passing through the diffuser and aperture in a manner to produce uniform illumination of the half tone screen.
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: August 21, 1984
    Assignee: Itek Corporation
    Inventor: Erik K. Nelson
  • Unique copyboard having unique light attenuator
    Patent number: 4387985
    Abstract: A unique light attenuator is positioned between a bank of lamps and the underside of a light diffuser which supports a subject to be photographed in a process camera, such light attenuator comprising a first circular pattern of constant width, constant density lines and a second superimposed pattern of straight lines which compensate for nonuniformity of illumination of the subject.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: June 14, 1983
    Assignee: Itek Corporation
    Inventors: Irving J. Magin, Erik K. Nelson