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:
Jun. 28, 1977
Filed:
May. 03, 1976
Rolf Arne Oscarsson, Pedricktown, NJ (US);
Nathaniel Convers Wyeth, Mendenhall, PA (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
The apparatus described facilitates the registry of image bearing transparencies with a plate having a photosensitive coating thereon. After exposure to light, the plate typically is subjected to chemical milling processes to produce printed circuit boards and the like. The registry apparatus includes upper and lower frames which form an enclosed region therebetween in which the plates and transparencies are placed in sandwich relationship. An outer gasket between the frames permits a vacuum to be applied to the enclosed region. An inner perimeter channel is formed in the opposed faces of each frame to permit a separate vacuum to hold the transparencies in place while the frames are opened to remove, insert or replace a plate. Successive plates may be processed without the necessity of re-registering the transparencies prior to each exposure.