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

Patent Owner(s)

Patent Owner	Address
THE REGENTS OF THE UNIVERSITY OF MICHIGAN	INNOVATION PARTNERSHIPS 1600 HURON PARKWAY ANN ARBOR MI 48109

International Classification(s)

• H05H:PLASMA TECHNIQUE
• F03H:PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERW....

• 2002 Application Filing Year
• H05H Class
• 256 Applications Filed
• 78 Patents Issued To-Date
• 30.47 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Beal, Brian	Ann Arbor, MI	2	10
# of filed Patents : 2 Total Citations : 10
Gallimore, Alec D	Ann Arbor, MI	5	46
# of filed Patents : 5 Total Citations : 46

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Patent Citation Ranking

• 9 Citation Count
• H05H Class

• 5.71 % this patent is cited more than
• 22 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
November 04, 2003	US,6640535,B2   US6640535B2	GRANTED PATENT AS SECOND PUBLICATION
December 26, 2002	US,20020194833,A1   US20020194833A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 6640535

Linear gridless ion thruster

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Abstract

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A linear gridless ion thruster (LGIT) is provided to serve as an ion source for spacecraft propulsion or plasma processing. The LGIT is composed of two stages: (1) an ionization stage composed of a hollow cathode, anode, and cusp magnetic field circuit to ionize the propellant gas; and (2) an acceleration stage composed of a downstream cathode, upstream anode, and a radial magnetic field circuit to accelerate ions created in the ionization stage. The LGIT replaces grids used in conventional ion thrusters (Kaufman guns) to accelerate ions with Hall-current electrons as in the case with conventional Hall thrusters.

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Description

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Claims

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Claims data not available

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Legal Events

 

• STCH2015
• FP2015
• LAPS2015
• REMI2015
• FPAY2011
• FPAY2007
• FEPP2006
• CC2004
• I2003
• P2002
• F2002
• PD2001

Date	Code	Event	Description
Nov 30, 2015	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Nov 04, 2015	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Nov 04, 2015
Nov 04, 2015	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES
Jun 12, 2015	REMI	MAINTENANCE FEE REMINDER MAILED
May 04, 2011	FPAY	FEE PAYMENT	year of fee payment: 8
May 04, 2007	FPAY	FEE PAYMENT	year of fee payment: 4
Dec 06, 2006	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY
May 11, 2004	CC	CERTIFICATE OF CORRECTION
Nov 04, 2003	I	Issuance
Dec 26, 2002	P	Published
Jun 13, 2002	F	Filing
Jun 13, 2001	PD	Priority Date