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. 25, 1989
Filed:
Jan. 22, 1988
Hajime Uyehara, Westminster, CA (US);
Smith International, Inc., Houston, TX (US);
Abstract
A seal for rock bits having a Belleville type spring and a lock-ring embedded in rubber is made in a process where the spring and the lock-ring are plasma etched before the metal parts are embedded in a partially cured rubber composition. The rubber is cured in a mold to provide a seal having significantly strengthened rubber-to-metal bonding. Preferably, highly saturated nitrile rubber is used for the seal, and the rubber composition preferably also includes lubricating agents which reduce friction between the rubber seal and rotating metal parts of the rock bits.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile