US5185129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ozone monitors
Assignee: Harvard University
•
Filing: 1991-02-28
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Granted: 1993-02-09
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Expires: 2011-02-28
Abstract
Abstract An ozone monitor including an ozone reactive surface, held within a container, which is adapted to specifically react with ozone. The surface is also adapted to fail to react with nitrogen dioxide in an amount which affects ozone quantitation by more than 20% when the nitrogen dioxide is provided at a concentration of 76 ppb and ozone is provided at a concentration of 30 ppb within a test gas.
Inventors
- 👤 Petros Koutrakis
- 👤 Jack M. Wolfson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:28
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/225; Y; Y10; Y10S; Y10S436/00; Y10S436/902
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
118 words
An ozone monitor comprising: an ozone reactive surface having a chemical coating comprising nitrite ions, a basic compound, and a hygroscopic component, said surface being constructed so as to specifically react with ozone, said surface also being constructed so as to fail to react with nitrogen dioxide in an amount which affects ozone quantitation by more than 20% when said nitrogen dioxide is provided at a concentration of 76 ppb and ozone is provided at a concentration of 30 ppb within a test gas; wherein said nitrite ions are reactive with ozone to form nitrate ions, wherein the quantity of said nitrate ions is indicative of the quantity of ozone monitored; said surface being held within a container.
Claim 2
Dependent Claim
118 words
An ozone monitor comprising: an ozone reactive surface having a chemical coating comprising nitrite ions, a basic compound, and a hygroscopic component, said surface being constructed so as to specifically react with ozone, said surface also being constructed so as to fail to react with nitrogen dioxide in an amount which affects ozone quantitation by more than 20% when said nitrogen dioxide is provided at a concentration of 76 ppb and ozone is provided at a concentration of 30 ppb within a test gas; wherein said nitrite ions are reactive with ozone to form nitrate ions, wherein the quantity of said nitrate ions is indicative of the quantity of ozone monitored; said surface being held within a container.
Claim 3
Dependent Claim
31 words
The ozone monitor of claim 1 wherein said surface is further constructed so s to allow quantitation of said ozone within a factor of 20% at humidities between 10% and 90%.
Claim 4
Dependent Claim
12 words
The ozone monitor of claim 1 wherein said hygroscopic component is glycerol.
Claim 5
Dependent Claim
33 words
The ozone monitor of claim 1 wherein said surface is further constructed so as to allow quantities of said ozone within a factor of 20% at temperatures between +50° F. and +100° F.
Claim 6
Dependent Claim
31 words
The ozone monitor of claim 4 wherein said surface is further constructed so as to allow quantitation of said ozone within a factor of 20% at humidities between 10% and 90%.
Claim 7
Dependent Claim
22 words
The ozone monitor of claim 1 wherein said coating comprises less than 0.003% by weight nitrate ions prior to exposure to ozone.
Claim 8
Dependent Claim
15 words
The ozone monitor of claim 6 wherein said nitrite ions are provided by sodium nitrite.
Claim 9
Dependent Claim
19 words
The ozone monitor of claim 6, further comprising a nitrate electrode positioned so as to detect said nitrate ions.
Claim 10
Dependent Claim
13 words
The ozone monitor of claim 1 wherein said basic compound is a carbonate.
Claim 11
Dependent Claim
12 words
The ozone monitor of claim 9 wherein said carbonate is potassium carbonate.
Claim 12
Dependent Claim
27 words
The ozone monitor of claim 1 wherein said surface is a liquid phase and said container is constructed so as to allow gaseous contact with said liquid.
Claim 13
Dependent Claim
25 words
The ozone monitor of claim 11 wherein said container comprises a membrane which allows gas to pass but not liquid to pass through said membranes.
Claim 14
Dependent Claim
13 words
The ozone monitor of claim 1 wherein said surface is a solid surface.
Claim 15
Dependent Claim
33 words
The ozone monitor of claim 13 wherein said surface is a filter and said container constructed so as to be located on a stationary object or on the outer clothing of a person.
Claim 16
Dependent Claim
31 words
The ozone monitor of claim 14 wherein said container envelops said filter and comprises openings to allow gas external to said monitor to pass through said openings to contact said filter.
Claim 17
Dependent Claim
34 words
The ozone monitor of claim 14 or 15 wherein said monitor is further provided with a fan or pump positioned so as to actively cause gas external to said monitor to contact said filter.
Claim 18
Dependent Claim
42 words
An ozone monitor comprising an ozone reactive surface comprising sodium nitrite, potassium carbonate, and glycerol wherein said nitrite ions are reactive with ozone to form nitrate ions, wherein the quantity of said nitrate ions is indicative of the quantity of ozone monitored.
Claim 19
Dependent Claim
42 words
An ozone monitor comprising an ozone reactive surface comprising sodium nitrite, potassium carbonate, and glycerol wherein said nitrite ions are reactive with ozone to form nitrate ions, wherein the quantity of said nitrate ions is indicative of the quantity of ozone monitored.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-02-09 | 1996-08-10 | 1997-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-09 | 2000-08-10 | 2001-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-09 | 2004-08-10 | 2005-02-09 | $7700.00 | Window Closed / Lapsed |