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:
Sep. 04, 1990
Filed:
Oct. 02, 1989
Thaddeus Wojcik, Hopewell, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
An improved stencil (10), for screen printing a material (22) onto a substrate (20), comprises a sheet (12) provided with a plurality of trapezoidal openings (14) arranged in alternating fashion such that the taper of each opening is opposite to the taper of the opening adjacent thereto. Providing the stencil with alternating trapezoidal openings (14) improves the resolution of the pattern of material (22) printed on the substrate when the material is deposited on the stencil and a squeegee blade (24) is displaced thereacross to force the material into the openings (14). The quality of the pattern of the material (22) printed on the substrate (20) can be further improved by providing a friction-reducing coating (34) on the sheet (12) to reduce the drag of the squeegee blade (24) as it travels thereacross.