US3975159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for determining the ozone contents of gas mixtures
Assignee: US Philips Corp
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Filing: 1975-03-13
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Granted: 1976-08-17
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Expires: 1995-03-13
Abstract
Abstract Determination of the ozone contents of gas mixtures by measuring the intensity of luminescent light emitted by a reaction of ozone with one of the halogenated fluorescein dyes eosin, erythrosin, cyanosin and Rose Bengal in combination with gallic acid.
Inventors
- 👤 Sybrandus VAN Heusden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:24
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/76; G01N21/766; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/206664
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
In the method for determining the ozone content of a gas mixture by measuring the intensity of chemiluminescent light emitted from an organic compound exposed thereto, the improvement wherein the organic compound is mixed with gallic acid and is an organic dye selected from the group consisting of eosin, erythrosin, cyanosin and Rose Bengal.
Claim 2
Dependent Claim
54 words
In the method for determining the ozone content of a gas mixture by measuring the intensity of chemiluminescent light emitted from an organic compound exposed thereto, the improvement wherein the organic compound is mixed with gallic acid and is an organic dye selected from the group consisting of eosin, erythrosin, cyanosin and Rose Bengal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |