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. 05, 2002
Filed:
Dec. 19, 2000
Applicant:
Inventors:
John E. Schilbe, Whitehall, MI (US);
Rebecca J. Boczkaja, Muskegon, MI (US);
Bruce M. Warnes, Muskegon, MI (US);
Assignee:
Howmet Research Corporation, Whitehall, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23G 1/14 ;
U.S. Cl.
CPC ...
C23G 1/14 ;
Abstract
A chemical cleaning method for cleaning an internal passage of an engine-run gas turbine engine airfoil wherein the airfoil is immersed in an inorganic hydroxide medium at superambient temperature and atmospheric pressure for a short time to remove accumulated oxides and dirt from the internal passage. The hydroxide medium can comprise molten KOH and immersion times of the engine-run airfoil not exceeding 10 minutes are involved.