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:
Nov. 15, 1994
Filed:
Sep. 30, 1992
Tokyo Ohka Kogyo Co., Ltd., Kanagawa, JP;
Abstract
A plasma processing apparatus for ashing semi-conductors wafers has a vertically elongate cylindrical chamber for generating a plasma for processing a workpiece housed therein with heat applied thereto. The cylindrical chamber has upper and lower open ends closed respectively by upper and lower chamber plates. A cooling coil is positioned above the upper chamber plate. A temperature controller actuates a fan unit to force an air flow over the cooling coil to the upper chamber plate for keeping the temperature in the cylindrical chamber within a predetermined range. The plasma processing apparatus includes inner and outer electrodes disposed inside and outside, respectively, of the cylindrical chamber, and a Radio Frequency generator for generating the plasma between the inner and outer electrodes.