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:
Feb. 05, 1991
Filed:
Nov. 17, 1989
Applicant:
Inventor:
Alan D Kington, Bristol, GB;
Assignee:
Rolls-Royce plc, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22C / ;
U.S. Cl.
CPC ...
164519 ; 164361 ;
Abstract
A shell mould comprising an inner layer of ceramic material which has a predetermined co-efficient of thermal expansion at a predetermined temperature and an outer ceramic layer of lower thermal co-efficient than the inner layer. The outer layer subjects the inner layer to compression on firing and during casting.