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. 24, 1990
Filed:
Nov. 03, 1988
Siemens Aktiengesellschaft, Berlin and Munich, US;
Abstract
In order to achieve a low dielectric constant and in order to improve the constant temperature resistance of radiation-sensitive synthetic resin lacquers, a photo-polymer system which is composed of a furyl acrylic acid esterified epoxy resin with phenoxy or epoxy end groups is employed as coating (2, 13, 4) on a substrate in the manufacture of printed circuits, particularly in multi-layer format. The cross-linking ensues with light in the wavelength range from about 150 through 400 nm preferably in the presence of a sensitizer without any following hot-hardening. As a consequence of its good solubility, the product can be easily processed and requires no intermediate layers when in a multi-layer format. A further area of employment lies in the field of integrated semiconductor circuits in VLSI technology when producing negative photo-resists.