US5237631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a fluorescent chemical sensor for determining the concentration of gases, vapors or dissolved gases in a sample
Assignee: Individual
•
Filing: 1992-03-31
•
Granted: 1993-08-17
•
Expires: 2012-03-31
Abstract
Abstract A method for the manufacture of an improved sensor element for determining the amount of oxygen in a sample, comprises the steps of: (a) mixing a fluorescent reagent with a silicone oil which has a molecular weight of 6,700 to 80,000 and most preferably in the range of between 15,000 and 30,000; (b) heating the mixture at a temperature in the range of between 150° to 350° C. and (c) adding an optical insulating material forming an optical insulating layer onto the fluorescent reagent. Optionally, a crosslinking agent is incorporated. In order to increase the efficiency of fluorescence, an additionally layer of light scattering material is inserted between the fluorescent reagent layer and that of the insulator.
Inventors
- 👤 Moshe Gavish
- 👤 Misha Roitberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:30
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N21/643; G01N21/75; G01N21/77; G01N21/7703; G01N2021/6432; G01N2021/6434; G01N2021/7769; G01N2021/7786; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998; Y10T436/207497
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
A method for the manufacture of a sensor element for determining the amount of oxygen dissolved in a sample, which comprises the steps of: (a) mixing a fluorescent reagent with a silicone oil which has a molecular weight in the range of 6,700 to 80,000; (b) heating the mixture at a temperature in the range of between 150° to 350° C., and (c) prior to or during said heating step (b), adding an optical insulating material into the fluorescent reagent, said material forming an optical insulating layer that protects the fluorescent reagent from outside light but will allow oxygen diffusion to sensing the reagent.
Claim 2
Independent Claim
104 words
A method for the manufacture of a sensor element for determining the amount of oxygen dissolved in a sample, which comprises the steps of: (a) mixing a fluorescent reagent with a silicone oil which has a molecular weight in the range of 6,700 to 80,000; (b) heating the mixture at a temperature in the range of between 150° to 350° C., and (c) prior to or during said heating step (b), adding an optical insulating material into the fluorescent reagent, said material forming an optical insulating layer that protects the fluorescent reagent from outside light but will allow oxygen diffusion to sensing the reagent.
Claim 3
Dependent Claim
29 words
The method for the manufacture of a sensor element according to claim 1, wherein said silicone oil has a molecular weight in the range of between 15,000 and 30,000.
Claim 4
Dependent Claim
23 words
The method according to claim 1, wherein said silicone oil comprises a mixture of dimethyl silicone, methyl hydrosilicone, diphenyl silicone and methyl-phenyl silicone.
Claim 5
Dependent Claim
12 words
The method according to claim 1, wherein a crosslinking agent is incorporated.
Claim 6
Dependent Claim
18 words
The method according to claim 4, wherein said crosslinking agent is selected from organic peroxides and diazo compounds.
Claim 7
Dependent Claim
19 words
The method according to claim 1, wherein the fluorescent reagents are selected from polycyclic aromatic homocyclic and heterocyclic molecules.
Claim 8
Dependent Claim
12 words
The method according to claim 6, wherein said fluorescent reagent is decacyclene.
Claim 9
Dependent Claim
12 words
The method according to claim 6, wherein said fluorescent reagent is perylene.
Claim 10
Dependent Claim
14 words
The method according to claim 1, wherein said optical insulation material is graphite powder.
Claim 11
Dependent Claim
17 words
The method according to claim 1, wherein a pigment is incorporated, being entrapped by the silicone oil.
Claim 12
Dependent Claim
25 words
The method according to claim 1, wherein an additional layer of light scattering material is inserted between the fluorescent reagent layer and the insulating layer.
References Cited (Backward Citations)
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US4752115A
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US5120510A
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US4925268A
Cited
US4892383A
Cited
US5119463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |