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:
Jul. 14, 2020
Filed:
Mar. 09, 2018
United Technologies Corporation, Farmington, CT (US);
Ryan C. Breneman, West Hartford, CT (US);
John E. Holowczak, South Windsor, CT (US);
John J. Marcin, Marlborough, CT (US);
Ingrid H. Kerscht, West Hartford, CT (US);
Steven J. Bullied, Pomfret Center, CT (US);
Dustin W. Davis, Marlborough, CT (US);
Raytheon Technologies Corporation, Farmington, CT (US);
Abstract
A method of removing a core of a cast component includes providing a casting that includes a silica based ceramic core in a temperature controlled closed volume; cycling temperature between a first temperature and a second temperature within the temperature controlled closed volume that repeatedly subjects the silica based ceramic core to a beta-to-alpha cristobalite transition that induces microfractures in the silica based ceramic core; and after the cycling temperature, chemically dissolving the silica based ceramic core from the casting.