US4994396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring the concentration or partial pressure of oxygen
Assignee: Dow Chemical Co
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Filing: 1987-12-14
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Granted: 1991-02-19
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Expires: 2007-12-14
Abstract
Abstract A sensor and a method for determining the concentration or the partial pressure of oxygen comprising: (a) means for transmitting and collecting light to and from a light modifying medium; and (b) a light modifying medium containing a luminescent dye dispersed in or upon a matrix and the dye is accessible to oxygen, wherein said luminescent dye contains a hexanuclear core of molybdenum, tungsten or mixtures thereof having 14 coordination sites, wherein each coordination site is occupied by a ligand.
Inventors
- 👤 Steven M. Lefkowitz
- 👤 Steven P. Webb
- 👤 Michael S. Paquette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:40
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/7703; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N21/643; G01N2021/6434; G01N2021/7706; G01N2021/772; G01N2021/7769; G01N2021/7786; Y; Y10; Y10S; Y10S436/00; Y10S436/80; Y10T; Y10T436/00; Y10T436/20; Y10T436/207497
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
136 words
A method for determining the concentration or the partial pressure of oxygen in media, comprising: (A) inserting a sensor into the media, wherein the sensor comprises: (a) means for transmitting and collecting light to and from a light modifying medium; and (b) a light modifying medium comprising a luminescent dye dispersed in or upon a matrix and the dye is accessible to oxygen; wherein said luminescent dye contains a hexanuclear core of molybdenum, tungsten or mixtures thereof having 14 coordination sites, wherein each coordination site is occupied by a ligand; (B) transmitting and collecting light to and from said light modifying medium; (C) measuring the intensity of luminescence collected from the light modifying medium and relating the measured intensity to a known standard to determine the concentration or partial pressure of oxygen present in the media.
Claim 2
Independent Claim
136 words
A method for determining the concentration or the partial pressure of oxygen in media, comprising: (A) inserting a sensor into the media, wherein the sensor comprises: (a) means for transmitting and collecting light to and from a light modifying medium; and (b) a light modifying medium comprising a luminescent dye dispersed in or upon a matrix and the dye is accessible to oxygen; wherein said luminescent dye contains a hexanuclear core of molybdenum, tungsten or mixtures thereof having 14 coordination sites, wherein each coordination site is occupied by a ligand; (B) transmitting and collecting light to and from said light modifying medium; (C) measuring the intensity of luminescence collected from the light modifying medium and relating the measured intensity to a known standard to determine the concentration or partial pressure of oxygen present in the media.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the means for transmitting and collecting light is an optical waveguide.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the optical waveguide is an optical fiber.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the matrix is a polymeric material.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the matrix is an organic polymeric material.
Claim 7
Dependent Claim
11 words
The method of claim 1 wherein the matrix is polymethylmethacrylate (PMMA).
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein the matrix is an organic polymer admixed with a plasticizer.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein the matrix is polymethylmethacrylate admixed with 2-ethylhexyl diphenyl phosphate (EDPP).
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein the luminescent dye contains a hexanuclear core of molybdenum.
Claim 11
Dependent Claim
15 words
The method of claim 1 wherein the luminescent dye contains a hexanuclear core of tungsten.
Claim 12
Dependent Claim
10 words
The method of claim 1 wherein the ligand is halide.
Claim 13
Dependent Claim
10 words
The method of claim 1 wherein the ligand is bromo.
Claim 14
Dependent Claim
10 words
The method of claim 1 wherein the ligand is iodo.
Claim 15
Dependent Claim
15 words
The method of claim 1 wherein the luminescent dye is Mo 6 Br 14 .sup.⊖⊖.
Claim 16
Dependent Claim
17 words
The method of claim 1 wherein the net electronic charge of luminescent dye is zero or neutral.
Claim 17
Dependent Claim
20 words
The method of claim 1 wherein the net electronic charge of the luminescent dye is greater than zero or positive.
Claim 18
Dependent Claim
16 words
The method of claim 16 wherein the positively charged luminescent dye is balanced by a counterion.
Claim 19
Dependent Claim
20 words
The method of claim 1 wherein the net electronic charge of the luminescent dye is less than zero or negative.
Claim 20
Dependent Claim
16 words
The method of claim 18 wherein the negatively charged luminescent dye is balanced by a counterion.
Claim 21
Dependent Claim
11 words
The method of claim 19 wherein the counterion is tetrabutyl ammonium.
Claim 22
Dependent Claim
21 words
The method of claim 19 wherein the luminescent dye is Mo 6 Br 14 .sup.⊖⊖ and the counterion is tetrabutyl ammonium.
References Cited (Backward Citations)
US3612866A
Cited
US4321057A
Cited
US4399099A
Cited
US4600310A
Cited
US4476870A
Cited
US4557900A
Cited
US4657736A
Cited
US4775514A
Cited
US4810655A
Cited
US4810654A
Cited
US4861727A
Cited
US4824789A
Cited
US4824789B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |