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. 01, 1980
Filed:
Nov. 20, 1978
Min H Tsai, Van Nuys, CA (US);
Unitek Corporation, Monrovia, CA (US);
Abstract
A method and material for making dental restorations by using a porcelain-covered body of a non-precious metal alloy. The alloy preferably includes about 58-68% nickel, 18-23% chromium, 6-10% molybdenum, up to 5% of at least one rare-earth element, up to 4% columbium plus tantalum, up to 2% iron, and lesser quantities of carbon, aluminum, titanium, silicon and manganese. The alloy is resistant to corrosion by mouth fluids, is easy to finish and polish, and is closely matched to the thermal-expansion properties of commercially available dental porcelains. The alloy does not contaminate alloy-melting crucibles, exhibits excellent bonding characteristics to dental porcelains, is easy to melt and cast, and has sufficient ductility to enable margin burnishing of dental-restoration castings of the alloy.