Denise John has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A drill bit comprises at least one blade, comprising a plurality of cutting elements in the form of polycrystalline diamond cutters disposed on a leading edge of the blade, at least one diamond impregnated cutting region, disposed behind the leading edge of the blade, and wherein at least one of the cutters disposed on the leading, edge is an off-tip cutting element, arranged so that it does not engage with the formation during drilling until bit wear has taken place.
Type:
Grant
Filed:
January 8, 2014
Date of Patent:
January 16, 2018
Assignee:
NOV Downhole Eurasia Limited
Inventors:
Stephen Williams, Denise John, Ryan Graham
Abstract: A drill bit comprises at least one blade, comprising a plurality of cutting elements in the form of polycrystalline diamond cutters disposed on a leading edge of the blade, at least one diamond impregnated cutting region, disposed behind the leading edge of the blade, and wherein at least one of the cutters disposed on the leading, edge is an off-tip cutting element, arranged so that it does not engage with the formation during drilling until bit wear has taken place.
Type:
Application
Filed:
January 8, 2014
Publication date:
December 3, 2015
Applicant:
NOV DOWNHOLE EURASIA LIMITED
Inventors:
Stephen Williams, Denise John, Ryan Graham
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