The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 1987
Filed:
Aug. 25, 1983
Donald F Sullivan, King of Prussia, PA (US);
Other;
Abstract
Improved resolution in a low cost non-critical photopolymer printing process is achieved by a non-volatile liquid image quality photopolymer layer disposed with air free surfaces sandwiched between two carrier surfaces, one being transparent and carrying a transparency image in contact with the liquid photopolymer to be exposed by radiation to cure the layer and produce the image pattern. In a typical example, 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. Film thicknesses from 0.006 mm to 0.05 mm can give resolutions for line widths and spacings as fine as 0.076 mm.