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

Patent Owner(s)

Patent Owner	Address
MARITIME HYDRAULICS A S	N-4604 KRISTIANSAND

International Classification(s)

• B66C:CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRAN....

• 1995 Application Filing Year
• B66C Class
• 116 Applications Filed
• 42 Patents Issued To-Date
• 36.21 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Myr, Egil	Kristiansand, NO	1	5
# of filed Patents : 1 Total Citations : 5

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Patent Citation Ranking

• 5 Citation Count
• B66C Class

• 2.65 % this patent is cited more than
• 28 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: 5677821

Method and device for detecting full magnetization of electro-permanent magnets

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Abstract

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A method and device for detecting full magnetization of an electro-permanent magnet which includes at least one permanent magnet part and at least one coil. Current is passed through the coil over a certain period of time in order to magnetize the electro-permanent magnet. The current through the coil of the magnet is measured during magnetization, and an increase of the derivative of the current curve is detected. A signal is given to an operator or computer if an increase in the current derivative is detected, which indicates full magnetization of the electro-permanent magnet.

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Description

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Claims

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Legal Events

 

• FPAY2009
• FPAY2005
• FPAY2001
• FEPP2000
• FEPP2000
• CC1998
• I1997
• STCF1997
• F1995
• AS1995
• PD1994

Date	Code	Event	Description
Apr 07, 2009	FPAY	FEE PAYMENT	year of fee payment: 12
Mar 16, 2005	FPAY	FEE PAYMENT	year of fee payment: 8
Mar 21, 2001	FPAY	FEE PAYMENT	year of fee payment: 4
Dec 04, 2000	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY
Dec 03, 2000	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY
Jan 06, 1998	CC	CERTIFICATE OF CORRECTION
Oct 14, 1997	I	Issuance
Oct 02, 1997	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Nov 30, 1995	F	Filing
Sep 01, 1995	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MYR, EGIL;REEL/FRAME:007872/0092 Owner name: MARITIME HYDRAULICS A.S., NORWAY Effective Date: Sep 01, 1995
Nov 30, 1994	PD	Priority Date