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. 01, 1997
Filed:
May. 02, 1996
Krishna G Sachdev, Hopewell Junction, NY (US);
Thomas E Lombardi, Poughkeepsie, NY (US);
Vincent P Peterson, Poughkeepsie, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
After a metallic insert has been used precisely to define a cavity for a microelectronic chip in a laminated, multi-sheet, predominantly ceramic substrate having metallic features, any green sheet and metal-polymer composite paste residues are removed from the metallic insert by immersing the metallic insert in an ultrasonically agitated bath containing a first solvent having a relatively high boiling point for about five to fifteen minutes, replacing the first solvent with a second solvent having a relatively low boiling point, and drying the metallic insert in hot air or hot nitrogen to remove the second solvent. Preferably, the first solvent is an alkoxy alcohol, such as 1-methoxy-2-propanol or 3-methoxy-1-butanol, or a hydroxy ester, such as ethyl lactate, and the second solvent is a lower alkyl alcohol, such as isopropanol. Alternatively, the first solvent may be a ketone or an alkyl ester. The metallic insert is rinsed in the second solvent, preferably in an ultrasonically agitated bath, to replace the first solvent with the second solvent before the metallic insert is dried to remove the first solvent.