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:
Oct. 06, 1987
Filed:
Aug. 29, 1986
Applicant:
Inventors:
James E Restall, Camberley, GB;
Cecil Hayman, Rickmansworth, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; C23F / ; C05C / ; C05C / ;
U.S. Cl.
CPC ...
156646 ; 134-2 ; 134 21 ; 134 30 ; 134 34 ; 134102 ; 156626 ; 156651 ; 156664 ; 156667 ; 156345 ;
Abstract
A halide based process for the removal of surface oxidation and corrosion contamination from metallic articles especially cracked superalloy turbine components, which utilizes a pulsed pressure cycle. Preferably the cycle is established by alternate evacuation and replenishment. A cycle operating at 150 torr or less and utilizing CHF.sub.3 hydrogen and inert gas as atmosphere is described. The evacuation phase of each cycle should preferably reach 20 torr or less. The process is also applicable to etching for detection of near-surface flaws.