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

Patent Owner(s)

Patent Owner	Address
SHEFFIELD GROUP LTD	4040 IDS CENTER MINNEAPOLIS MN 55402

International Classification(s)

• Non-US Classification not provided for expired patents

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Burton, Charles V	Excelsior, MN	13	1707
Carlson, Casey L	Edina, MN	79	1400
Peterson, Gregory K	North Oaks, MN	12	51
Stumpf, William E	Minneapolis, MN	47	3723
Weber, Jeffrey A	Minneapolis, MN	47	1408

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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: D334623

Traction unit for removing loading from the back

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