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

Patent Owner(s)

• GEOTRONICS AB

International Classification(s)

• G02B:OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
• G01C:MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING....
• G01B:MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIME....

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Marcus, Holger	Lidingo, SE	2	21
Nordstrom, Lennart	Lidingo, SE	9	225
Scholdstrom, Ragnar	Lidingo, SE	2	21

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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: 4227802

Apparatus for measuring the distance to a point on the inner wall of a hot furnace

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