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

Patent Owner(s)

Patent Owner	Address
VETCO GRAY INC	4424 WEST SAM HOUSTON PARKWAY NORTH SUITE 100 HOUSTON TX 77041

International Classification(s)

• C08J:WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTE....
• C08G:MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN B....
• C08F:MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONL....
• C08K:USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUB....

• 2015 Application Filing Year
• C08J Class
• 2246 Applications Filed
• 1523 Patents Issued To-Date
• 67.81 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Duong, Hung	Houston, US	37	550
# of filed Patents : 37 Total Citations : 550
Pitta, Anil	Cypress, US	2	0
# of filed Patents : 2 Total Citations : 0
Sun, Li	Houston, US	351	3994
# of filed Patents : 351 Total Citations : 3994

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Patent Citation Ranking

• 0 Citation Count
• C08J 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	Feb 22, 2025
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Feb 22, 2029

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 7.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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 22, 2017	US,9738762,B2   US9738762B2	GRANTED PATENT AS SECOND PUBLICATION
March 10, 2016	US,20160068642,A1   US20160068642A1	FIRST PUBLISHED PATENT APPLICATION

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