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

Patent Owner(s)

Patent Owner	Address
PEABODY ENERGY CORPORATION	701 MARKET STREET STE 700 ST LOUIS MO 63101

International Classification(s)

• H02P:CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATO....

• 2008 Application Filing Year
• H02P Class
• 1050 Applications Filed
• 663 Patents Issued To-Date
• 63.15 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Shackelford,, IV James Luther	Owensville, US	2	10
# of filed Patents : 2 Total Citations : 10

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Patent Citation Ranking

• 5 Citation Count
• H02P Class

• 4.79 % 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

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
May 24, 2011	US,7948197,B2   US7948197B2	GRANTED PATENT AS SECOND PUBLICATION
August 28, 2008	US,20080203949,A1   US20080203949A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 7948197

Controlling torsional shaft oscillation

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Abstract

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Torsional oscillation of a shaft in a swing drive system of an excavator is minimized by monitoring torsional strain of the shaft. An electric motor provides torque to the shaft in response to a drive signal provided by a converter. A compensation circuit produces a compensation signal as a function of torsional strain of the shaft. A field excitation circuit or regulator powers a converter as a function of the compensation signal such that a counter torque is provided to the shaft and torsional oscillation of the shaft is reduced.

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Description

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Claims

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Legal Events

 

• AS2023
• STCH2019
• LAPS2019
• FP2019
• FEPP2019
• AS2017
• AS2017
• AS2016
• AS�2016
• AS2015
• AS2015
• FPAY2014
• I2011
• STCF2011
• P2008
• AS2008
• F2008
• PD2007

Date	Code	Event	Description
May 11, 2023	AS	ASSIGNMENT	free format text: RELEASE BY SECURED PARTY;ASSIGNOR:WILMINGTON TRUST, NATIONAL ASSOCIATION;REEL/FRAME:063627/0001 Owner name: PEABODY ENERGY CORPORATION, MISSOURI Effective Date: May 11, 2023
Jul 01, 2019	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Jul 01, 2019	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES	free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
May 24, 2019	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: May 24, 2019
Jan 14, 2019	FEPP	FEE PAYMENT PROCEDURE	free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Apr 03, 2017	AS	ASSIGNMENT	free format text: RELEASE OF LIEN ON PATENTS;ASSIGNOR:WILMINGTON SAVINGS FUND SOCIETY, FSB, AS SUCCESSOR TO U.S. BANK NATIONAL ASSOCIATION;REEL/FRAME:042146/0923 Owner name: PEABODY ENERGY CORPORATION, MISSOURI Effective Date: Apr 03, 2017 free format text: RELEASE OF LIEN ON PATENTS;ASSIGNOR:CITIBANK, N.A., AS ADMINISTRATIVE AGENT;REEL/FRAME:042146/0812 Owner name: PEABODY ENERGY CORPORATION, MISSOURI Effective Date: Apr 03, 2017
Apr 03, 2017	AS	ASSIGNMENT	free format text: SECURITY INTEREST;ASSIGNOR:PEABODY ENERGY CORPORATION;REEL/FRAME:041824/0053 Owner name: WILMINGTON TRUST, NATIONAL ASSOCIATION, AS PRIORIT Effective Date: Apr 03, 2017
Dec 15, 2016	AS	ASSIGNMENT	free format text: RELEASE BY SECURED PARTY;ASSIGNOR:CITIBANK, N.A.;REEL/FRAME:040661/0325 Owner name: PEABODY ENERGY CORPORATION, MISSOURI Effective Date: Dec 15, 2016
Jun 16, 2016	AS�	SECURITY INTEREST	free format text: PATENT SECURITY AGREEMENT;ASSIGNOR:PEABODY ENERGY CORPORATION;REEL/FRAME:039734/0819 Owner name: CITIBANK, N.A., DELAWARE Effective Date: Jun 16, 2016
Mar 16, 2015	AS	ASSIGNMENT	free format text: SECURITY INTEREST;ASSIGNOR:PEABODY ENERGY CORPORATION;REEL/FRAME:035175/0757 Owner name: U.S. BANK NATIONAL ASSOCIATION, CONNECTICUT Effective Date: Mar 16, 2015
Feb 05, 2015	AS	ASSIGNMENT	free format text: SECURITY INTEREST;ASSIGNOR:PEABODY ENERGY CORPORATION;REEL/FRAME:034925/0375 Owner name: CITIBANK, N.A., AS ADMINISTRATIVE AGENT, DELAWARE Effective Date: Feb 05, 2015
Nov 14, 2014	FPAY	FEE PAYMENT	year of fee payment: 4
May 24, 2011	I	Issuance
May 04, 2011	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Aug 28, 2008	P	Published
Feb 18, 2008	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHACKELFORD, JAMES LUTHER, IV;REEL/FRAME:020662/0568 Owner name: PEABODY ENERGY CORPORATION, MISSOURI Effective Date: Feb 18, 2008 free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHACKELFORD, JAMES LUTHER, IV;REEL/FRAME:020662/0568 Owner name: PEABODY ENERGY CORPORATION,MISSOURI Effective Date: Feb 18, 2008
Jan 18, 2008	F	Filing
Feb 27, 2007	PD	Priority Date