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

Patent Owner(s)

Patent Owner	Address
SHELL OIL COMPANY	P O BOX 2463 INTELLECTUAL PROPERTY HOUSTON TX 77252-2463

International Classification(s)

• E21B:EARTH OR ROCK DRILLING

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
De, Rouffignac Eric	Houston, TX	8	1364
# of filed Patents : 8 Total Citations : 1364
Vinegar, Harold J	Houston, TX	339	71819
# of filed Patents : 339 Total Citations : 71819

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Patent Citation Ranking

• 358 Citation Count
• E21B Class

• 96.83 % this patent is cited more than
• 25 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

Full Text

US Patent No: 9874194

Ignition system and method for operating an ignition system

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Abstract

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A method is described for operating an ignition system for an internal combustion engine, including a primary voltage generator and a bypass, in particular, a boost converter for maintaining a spark generated with the aid of the primary voltage generator, the method includes an ascertainment of a modified energy requirement for an ignition spark, which is to be maintained with the aid of the bypass and a modification of the working mode of the bypass in response thereto.

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Description

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Claims

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Legal Events

 

• LAPS2023
• STCH2023
• FP2023
• FEPP2022
• MAFP2018
• FPAY2014
• I2011
• STCF2011
• AS2009
• P2009
• AS2008
• F2008
• PD2007

Date	Code	Event	Description
Mar 20, 2023	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: SMALL ENTITY
Mar 20, 2023	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Feb 15, 2023	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Feb 15, 2023
Oct 03, 2022	FEPP	FEE PAYMENT PROCEDURE	free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY
May 21, 2018	MAFP	MAINTENANCE FEE PAYMENT	free format text: PAYMENT OF MAINTENANCE FEE, 8TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2552) year of fee payment: 8
May 30, 2014	FPAY	FEE PAYMENT	year of fee payment: 4
Feb 15, 2011	I	Issuance
Jan 26, 2011	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Mar 13, 2009	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TECUMSEHPOWER COMPANY;REEL/FRAME:023693/0067 Owner name: CERTIFIED PARTS CORPORATION, WISCONSIN Effective Date: Mar 13, 2009
Mar 12, 2009	P	Published
Sep 03, 2008	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GRYBUSH, ANTHONY F.;REEL/FRAME:021554/0927 Owner name: TECUMSEH POWER COMPANY, WISCONSIN Effective Date: Sep 03, 2008
Aug 28, 2008	F	Filing
Sep 08, 2007	PD	Priority Date