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

Patent Owner(s)

Patent Owner	Address
WATKINS MANUFACTURING CORPORATION	1280 PARK CENTER DRIVE VISTA CA 92081

International Classification(s)

• G01N:INVESTIGATING OR ANALYSING MATERIALS BY DETERMININ....

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Shakespeare, Simon Adam	Atherstone, GB	4	22
# of filed Patents : 4 Total Citations : 22
Storkey, Matthew Emmanuel Milton	Trumpington, GB	10	202
# of filed Patents : 10 Total Citations : 202

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Patent Citation Ranking

• 5 Citation Count
• G01N Class

• 8.82 % this patent is cited more than
• 13 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
July 03, 2012	US,8212222,B2   US8212222B2	GRANTED PATENT AS SECOND PUBLICATION
September 03, 2009	US,20090219513,A1   US20090219513A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 8212222

Spa chlorine measurement via temperature shift UV spectrometry

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Abstract

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A method of measuring chlorine concentration of a solution comprising making a first measurement of transmission of ultraviolet light at a selected wavelength through a first sample of said solution at a first temperature; making a second measurement of the transmission of ultraviolet light at said selected wavelength through a second sample of said solution at a second temperature, said second temperature being different than said first temperature; and determining the chlorine concentration in said solution using the results of said first and second measurements.

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Description

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Claims

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Legal Events

 

• STCH2016
• FP2016
• LAPS2016
• REMI2016
• I2012
• P2009
• F2009
• AS2009
• PD2008

Date	Code	Event	Description
Aug 01, 2016	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Jul 03, 2016	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Jul 03, 2016
Jul 03, 2016	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES
Feb 12, 2016	REMI	MAINTENANCE FEE REMINDER MAILED
Jul 03, 2012	I	Issuance
Sep 03, 2009	P	Published
Feb 18, 2009	F	Filing
Jan 28, 2009	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHAKESPEARE, SIMON ADAM;STORKEY, MATTHEW EMMANUEL MILTON;REEL/FRAME:022281/0715 Owner name: WATKINS MANUFACTURING CORPORATION, CALIFORNIA Effective Date: Jan 28, 2009
Feb 28, 2008	PD	Priority Date