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:
May. 12, 1981
Filed:
Jun. 05, 1979
Applicant:
Inventors:
Shinya Iida, Tama, JP;
Kazuyoshi Ueki, Ohme, JP;
Hideo Komatsu, Hinodemachi, JP;
Tatsumi Mitzutani, Kokubunji, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; C23F / ;
U.S. Cl.
CPC ...
156643 ; 156646 ; 156656 ; 1566591 ; 156665 ; 2041 / ; 252 791 ; 134 29 ; 134 30 ;
Abstract
A method for dry-etching Al and Al alloys is disclosed, which comprises producing plasma discharges with a mixed gas comprising boron trichloride and freon and/or oxygen incorporated therein and patterning Al or an Al alloy by the produced discharges. In this dry etching method, the etch rate of Al or an Al alloy can be remarkably improved over the etch rate attainable according to the conventional techniques, and the difference of the etch rate between Al or an Al alloy and other material can be remarkably increased.