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. 28, 2001
Filed:
Jun. 12, 1998
Krishna G. Sachdev, Hopewell Junction, NY (US);
John T. Butler, Hopewell Junction, NY (US);
Michael E. Cropp, LaGrangeville, NY (US);
Donald W. DiAngelo, Fishkill, NY (US);
John F. Harmuth, Pleasant Valley, NY (US);
James N. Humenik, LaGrangeville, NY (US);
John U. Knickerbocker, Hopewell Junction, NY (US);
Daniel S. Mackin, Pleasant Valley, NY (US);
Glenn A. Pomerantz, Kerhonkson, NY (US);
David E. Speed, Newtown, CT (US);
Candace A. Sullivan, Pleasant Valley, NY (US);
Bruce E. Tripp, Rhinebeck, NY (US);
James C. Utter, Fishkill, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
This invention relates to the cleaning of objects that relate to semiconductor printing, such as, for example, screening masks. This invention is basically directed to removing, for example, an organic polymer-metal composite paste from screening masks used in printing conductive metal patterns onto ceramic green sheets in the fabrication of semiconductor packaging substrates. More particularly, this invention is concerned with the automated in-line cleaning of paste screening masks with an aqueous alkaline solution of a quaternary ammonium hydroxide as a more environmentally friendly alternative to non-aqueous organic solvents-based cleaning in screening operations for the production multilayer ceramic (MLC) substrates.