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

Patent Owner(s)

• INSTITUT FRANCAIS DU PETROLE;SIEMENS ENERGY & AUTOMATION, INC.;VICKERS E.S.D., INC.

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Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Hohn, Richard E	US	2	30
Mcdonald, David I	US	7	345
Wiebe, Harold D	US	4	183

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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: 4580209

METHOD AND APPARATUS FOR MACHINE ABSOLUTE POSITIONING MEASUREMENT

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