Patents Represented by Attorney R. Henn
  • Patent number: 4888270
    Abstract: Paste-consistency photopolymer is imaged onto printed wiring boards by coating the board overall and positioning the photographic film over the board in register and off-contact. A resilient blade is pressed against the phototool at one end of the board and drawn across the surface, thus forcing the photographic film into intimate contact with the photopolymer and purging all air therebetween. Mounted on the resilient blade aft of leading edge is a shuttered tubular lamp which hardens the photopolymer where the photographic film is clear, so that in a single pass the photographic film is sequentially mated and photopolymer exposed, to produce line widths unmatched by competing dry film systems and at speeds of 0.5 feet per second.
    Type: Grant
    Filed: June 2, 1987
    Date of Patent: December 19, 1989
    Assignee: M & T Chemicals Inc.
    Inventor: Donald F. Sullivan