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. 19, 1992
Filed:
Mar. 21, 1991
Applicant:
Inventor:
Wei C Hsie, Eden Prairie, MN (US);
Assignee:
Seagate Technology, Inc., Scotts Valley, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; C23F / ;
U.S. Cl.
CPC ...
156665 ; 156664 ; 156662 ; 752 793 ;
Abstract
An etchant for etching iron-silicon-aluminum trialloys comprises a one liter aqueous solution of ammonium bifluoride and nitric acid in the range of about 0.03 to 0.1 Moles of ammonium bifluoride and 3.5 to 10 Moles of nitric acid with the remainder being water. The etch is applied directly to the iron-silicon-aluminum trially at room temperature in an isotropic and isothermal process.