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

Patent Owner(s)

Patent Owner	Address
AEL MINING SERVICES LIMITED	2196 JOHANNESBURG

International Classification(s)

• 1004:OTHER MEASURING INSTRUMENTS, APPARATUS AND DEVICES

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Dreyer, Pieter Etienne	Scottburg, ZA	9	95
Holdcroft, Robert James	Johannesburg, ZA	2	7
Marillier, Neville Robert	Germiston, ZA	2	7
Wilson, Laurence Justin Pienaar	Midrand, ZA	3	4

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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 No: D644948

Borehole condition monitors

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