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:
Oct. 10, 2000
Filed:
Sep. 24, 1998
Tom Scott Roberts, Abbeymead, GB;
Clive Jarvis, Swindon, GB;
Camco International (UK) Limited, Stonehouse, GB;
Abstract
A rotary drill bit comprises a bit body having a leading face and a gauge region, cutting elements mounted on the bit body, fluid channels extending outwardly across the leading face towards the gauge region, and nozzles for supplying fluid to the channels. At the outer end of each alternate channel, in the gauge region, is an outwardly facing junk slot which extends across only a part of the width of the channel, and a bearing surface which extends across the other part of the channel and bears against a wall of the borehole being drilled. In the channel, inwardly of the bearing surface, is an opening into an enclosed passage which passes internally through the bit body to an outlet. The bearing surfaces at the end of the channels increase the peripheral bearing surface area of the drill bit, thus improving stability, but fluid can still escape from all parts of each channel.