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:
Mar. 13, 1984
Filed:
Feb. 22, 1982
Francis J Rendulic, Sudbury, MA (US);
Robert K Trasavage, Whitinsville, MA (US);
Paul A Boduch, Lakewood, CO (US);
W. R. Grace & Co., Cambridge, MA (US);
Abstract
Printed circuit boards are made by imaging a liquid polymer which has been coated onto the board. The imaging is accomplished while the polymer is wet with the photo tool in a close air gap relationship with the coated board. The uncured polymer which remains liquid is removed after imaging so that the board can be processed by etch resist, plate resist, or solder mask techniques. The cured polymer is removed by stripping with an alkaline solution. The apparatus consists of single station or multi-station equipment to carry out the unit operations of maintaining the board in a set position, coating with a liquid polymer, placing a photo tool in registration with the circuit board blank and in close relationship with the coating, and imaging the liquid polymer via the photo tool to cause areas of the coating to solidify and other areas to remain liquid.