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

Patent Owner(s)

Patent Owner	Address
NIPPON FERROFLUIDICS CORPORATION	MINATO-KU TOKYO 107

International Classification(s)

• H02K:DYNAMO-ELECTRIC MACHINES

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Yamamura, Akira	Tokyo, JP	28	363
# of filed Patents : 28 Total Citations : 363

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Patent Citation Ranking

• 7 Citation Count
• H02K Class

• 0 % this patent is cited more than
• 34 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: 5046151

Magnetic bearing device

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Abstract

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This invention discloses a magnetic bearing device having a control coil which supports a rotor in a vertical direction and a current controller which increases control current according to an increase in the clearance between the control coil and the rotor. The current controller includes a gain controller which controls the control current with a larger gain when clearance between the control coil and the rotor is less than a certain distance, and with a smaller gain when clearance between the control coil and the rotor is more than that distance.

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Description

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Claims

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Claims data not available

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Legal Events

 

• STCH2018
• LAPS1999
• FP1999
• REMI1999
• SULP1995
• FPAY1995
• REMI1995
• FEPP1994
• FEPP1992
• I1991
• F1990
• PD1988

Date	Code	Event	Description
Jan 27, 2018	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Sep 05, 1999	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES
Sep 03, 1999	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Sep 03, 1999
Mar 30, 1999	REMI	MAINTENANCE FEE REMINDER MAILED
Sep 05, 1995	SULP	SURCHARGE FOR LATE PAYMENT
Sep 05, 1995	FPAY	FEE PAYMENT	year of fee payment: 4
Apr 11, 1995	REMI	MAINTENANCE FEE REMINDER MAILED
Dec 09, 1994	FEPP	FEE PAYMENT PROCEDURE	free format text: PAT HLDR NO LONGER CLAIMS SMALL ENT STAT AS INDIV INVENTOR (ORIGINAL EVENT CODE: LSM1); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Dec 07, 1992	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Sep 03, 1991	I	Issuance
Jul 09, 1990	F	Filing
Jul 29, 1988	PD	Priority Date