Patents by Inventor Peter M. Koelsch

Peter M. Koelsch 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).

  • Multilayer dry-film positive-acting o-quinone diazide photoresist with integral laminable layer, photoresist layer, and strippable carrier layer
    Patent number: 4672020
    Abstract: Dry-film, positive-acting photoresist layers are used in the formation of many articles such as circuit boards, printing plates and the like. Laminable monolayers of photoresist suffer from slow speeds, brittleness, and narrow latitude during development and exposure. The use of a thermoplastic, crosslinked or crosslinkable integral adhesive layer on the dry-film, positive-acting photoresist layer improves the properties and performance of the photoresist.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: June 9, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Peter M. Koelsch, John P. Vikesland
  • Narrow band light absorbing filter
    Patent number: 4601532
    Abstract: An optical transmission radiation filter absorbing between 320 and 500 nm comprises a polymeric film having a benzylidene or naphthalamide dye in combination with a phenol-formaldehyde resin which shifts the absorbing wavelength of the dyes.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: July 22, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Arlene K. Musser, Peter M. Koelsch
  • Exposure latitude improvement in printing positive-acting color pre-press proofs
    Patent number: 4571373
    Abstract: The exposure latitude of positive-acting, color pre-press proofing photosensitive articles can be improved by positioning an optical filter between the separation half-tone positive and the photosensitive article.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: February 18, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Arlene K. Musser, Peter M. Koelsch