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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other

Patent Owner(s)

Patent Owner	Address
NATIONAL OILWELL VARCO L P	7909 PARKWOOD CIRCLE DRIVE HOUSTON TX 77036

International Classification(s)

• B24D:TOOLS FOR GRINDING, BUFFING, OR SHARPENING
• E21B:EARTH OR ROCK DRILLING

• 2010 Application Filing Year
• B24D Class
• 179 Applications Filed
• 95 Patents Issued To-Date
• 53.08 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Jiang, Alan Honggen	Gloucester, GB	7	500
# of filed Patents : 7 Total Citations : 500
Sreshta, Harold	Houston, US	10	620
# of filed Patents : 10 Total Citations : 620

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Patent Citation Ranking

• 57 Citation Count
• B24D Class

• 98.73 % this patent is cited more than
• 14 Age

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge after expiration - Late payment is unavoidable	$700.00	$350.00	$175.00
Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

Full Text

US Patent Application No: 2011/0171,414

Sacrificial Catalyst Polycrystalline Diamond Element

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Abstract

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A superhard composite material comprising a polycrystalline diamond cutter (PDC) having a cutting surface and cutting edges having a polycrystalline diamond thickness of about 3 mm is integrally formed with a sacrificial catalyst source that is removed later in the processing of the of the cutter.

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Description

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