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:
Jul. 27, 1999
Filed:
Oct. 16, 1997
James G Balz, Walden, NY (US);
Cynthia J Calli, Newburgh, NY (US);
Jon A Casey, Poughkeepsie, NY (US);
David C Long, Wappingers Falls, NY (US);
Daniel S Mackin, Pleasant Valley, NY (US);
Keith C O'Neil, Hughsonville, NY (US);
Brenda L Peterson, Wappingers Falls, NY (US);
Glenn A Pomerantz, Kerhonkson, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An apparatus and method is provided for vacuum screen printing a greensheet having vias and both vias and open areas whereby vacuum leakage in the apparatus is minimized and avoids bowing of the screen over the open area of the greensheet. An interposer apparatus is provided comprising at least two layers having vertical through openings in registration with the via openings of the greensheet and screen. The interposer also comprises vertical through openings communicating with the open area of the greensheet and with vent channels of the interposer. A porous membrane is also used either alone or in conjunction with the interposer to provide enhanced screening results.