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

Patent Owner(s)

Patent Owner	Address
NEC CORPORATION	7-1 SHIBA 5-CHOME MINATO-KU TOKYO 108-8001
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY	TOKYO

International Classification(s)

• H04L:TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAP....

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Fujiwara, Mikio	Tokyo, JP	43	433
# of filed Patents : 43 Total Citations : 433
Nambu, Yoshihiro	Tokyo, JP	10	202
# of filed Patents : 10 Total Citations : 202
Sasaki, Masahide	Tokyo, JP	19	38
# of filed Patents : 19 Total Citations : 38
Tomita, Akihisa	Tokyo, JP	22	260
# of filed Patents : 22 Total Citations : 260
Toyoshima, Morio	Tokyo, JP	8	46
# of filed Patents : 8 Total Citations : 46
Yoshino, Ken-ichiro	Tokyo, JP	45	449
# of filed Patents : 45 Total Citations : 449

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Feb 13, 2025

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 11.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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
August 13, 2013	US,8509446,B2   US8509446B2	GRANTED PATENT AS SECOND PUBLICATION
July 14, 2011	US,20110170695,A1   US20110170695A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 8509446

Time-bin polarization format exchange technique for entangled optical source

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Abstract

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It is an object of the present invention to provide a network system for quantum key distribution (QKD) for free space and fiber networks. The system of the present invention generates a couple of photons which have different wavelength and inputs each of the photons into the asymmetric Mach-Zehnder interferometer to obtain time-bin entangled state. It provides polarization information with one part of the photons. Then it can obtain hybrid quantum entanglement. The system of the present invention may be used hybrid quantum key distribution system applied for both free space and fibers.

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Description

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Claims

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Legal Events

 

• LAPS2017
• STCH2017
• FP2017
• REMI2017
• FEPP2015
• I2013
• P2011
• AS2011
• F2010
• PD2010

Date	Code	Event	Description
Sep 11, 2017	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES	free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.)
Sep 11, 2017	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Aug 13, 2017	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Aug 13, 2017
Mar 24, 2017	REMI	MAINTENANCE FEE REMINDER MAILED
Nov 02, 2015	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Aug 13, 2013	I	Issuance
Jul 14, 2011	P	Published
Mar 16, 2011	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FUJIWARA, MIKIO;TOYOSHIMA, MORIO;SASAKI, MASAHIDE;AND OTHERS;SIGNING DATES FROM 20101210 TO 20110111;REEL/FRAME:025965/0063 Owner name: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIO free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FUJIWARA, MIKIO;TOYOSHIMA, MORIO;SASAKI, MASAHIDE;AND OTHERS;SIGNING DATES FROM 20101210 TO 20110111;REEL/FRAME:025965/0063 Owner name: NEC CORPORATION, JAPAN
Dec 28, 2010	F	Filing
Jan 14, 2010	PD	Priority Date