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Country	kind	publication No.	Filing Date	Type	Sub-Type

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

Patent Owner(s)

• DUPONT TEIJIN ADVANCED PAPERS (JAPAN), LTD.

International Classification(s)

• H02K:DYNAMO-ELECTRIC MACHINES
• B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....
• H01F:MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF M....
• B29L:INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RE....

• 2014 Application Filing Year
• H02K Class
• 2148 Applications Filed
• 1788 Patents Issued To-Date
• 83.25 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Fujimori, Tatsushi	Tokyo, JP	13	67
# of filed Patents : 13 Total Citations : 67
Kondo, Chihiro	Tokyo, JP	15	17
# of filed Patents : 15 Total Citations : 17
Naruse, Shinji	Tokyo, JP	24	168
# of filed Patents : 24 Total Citations : 168
Tanaka, Yasunori	Tokyo, JP	95	1235
# of filed Patents : 95 Total Citations : 1235

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• 0 Citation Count
• H02K Class

• 0 % this patent is cited more than
• 8 Age

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
7.5 Year Payment	$3600.00	$1800.00	$900.00	Apr 3, 2025
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Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

Full Text

US Patent No: 7807830

Manufacture of pure hydralazine salts

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Abstract

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The present invention provides an improved process of preparing hydralazine hydrochloride, which involves the preparation of 1-chlorophthalazine salt and further reacting with hydrazine followed by purification of hydralazine hydrochloride, which is free of phosphate, does not contain any individual impurities more than 0.05%, total impurities less than 0.5%, and a hydrazine content of not more than 0.001%, and preferably less than 0.0003%. One benefit of improved purity is enhanced storage stability.

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Description

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Claims

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Legal Events

 

• MAFP2024
• MAFP2020
• I2016
• STCF2016
• P2015
• F2015
• AS2015

Date	Code	Event	Description
Jan 05, 2024	MAFP	MAINTENANCE FEE PAYMENT	free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY year of fee payment: 8
Jan 06, 2020	MAFP	MAINTENANCE FEE PAYMENT	free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY year of fee payment: 4
Jul 05, 2016	I	Issuance
Jun 15, 2016	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Jul 30, 2015	P	Published
Apr 03, 2015	F	Filing
Apr 03, 2015	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MANSON, RICHARD B.;MILLS, NIGEL G.;WISEMAN, TERRY R.;SIGNING DATES FROM 20090831 TO 20100823;REEL/FRAME:035331/0544 Owner name: PREMARK FEG L.L.C., ILLINOIS