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:
May. 12, 1987
Filed:
Oct. 24, 1985
Douglas L Clinkscales, Houston, TX (US);
Stephen B Long, Missouri City, TX (US);
Carl S Wheeler, Houston, TX (US);
Hughes Tool Company-USA, Houston, TX (US);
Abstract
A method for hardening a selected region of a steel bearing surface of an earth boring bit using the steps of stretching a rubber protector over a seal region to be protected from treatment (the rubber being selected from the group consisting of silicone, neoprene and nitrile), exposing the bearing surface and protector to a medium (selected from the group consisting of carburizing, nitriding, carbonitriding, siliconizing, chromizing and boronizing) of the type for altering the chemical composition of the steel to be hardened, heating the medium and bearing surface, cooling the bearing and protector, and removing and cleaning the surface.