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:
Aug. 09, 1994
Filed:
Dec. 09, 1993
Makarand H Chipalkatti, Lexington, MA (US);
Elizabeth A Trickett, Framingham, MA (US);
Other;
Abstract
A method of preparing an electrically insulating polymer substrate, particularly those containing an aromatic group, for the reception of an electrically conductive pattern, said substrate having a glass transition temperature or a softening temperature, comprises the steps of: performing a first cleaning of the substrate; heating the substrate in a nitrogen atmosphere for about 3 hours at a temperature of about 20.degree. C. below the glass transition temperature or the softening temperature of the substrate; cooling the substrate to room temperature; roughening the surface of the substrate by, for example, etching said substrate in a chromic acid-containing solution for about 3 minutes at a temperature of between 65.degree. C. and 70.degree. C.; and performing a second cleaning and drying of the substrate.