US2736813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analysis
Assignee: Compagnie de Saint Gobain SA
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Filing: 1952-03-05
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Granted: 1956-02-28
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Expires: 1972-03-05
Abstract
No abstract record available.
Inventors
- 👤 Cherrier Claude Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:29
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE METHOD OF ANALYZING A GAS FOR SO2 THAT COMPRISES PASSING LIGHT, HAVING A WAVE LENGTH CORRESPONDING TO THAT OF A SPECTRUM ABSORPTION BAND OF SO2 IN ULTRAVIOLET, BY ONE PATH TO A PHOTOELECTRIC CELL, PASSING IDENTICAL LIGHT BY ANOTHER PATH TO ANOTHER SUCH CELL, ACTIVATING BALANCED AMPLIFIERS BY THE CURRENT FROM SAID CELLS, DIRECTING THE OUTPUT OF SAID AMPLIFIERS TO BALANCED SIGNALLING APPARATUS, ADMITTING THE GAS TO BE ANALYZED TO ONE SAID PATH ONLY, AND DETERMINING THE PRESENCE OF SO2 BY THE SIGNAL OF THE SIGNALLING APPARATUS.
Claim 2
Independent Claim
88 words
THE METHOD OF ANALYZING A GAS FOR SO2 THAT COMPRISES PASSING LIGHT, HAVING A WAVE LENGTH CORRESPONDING TO THAT OF A SPECTRUM ABSORPTION BAND OF SO2 IN ULTRAVIOLET, BY ONE PATH TO A PHOTOELECTRIC CELL, PASSING IDENTICAL LIGHT BY ANOTHER PATH TO ANOTHER SUCH CELL, ACTIVATING BALANCED AMPLIFIERS BY THE CURRENT FROM SAID CELLS, DIRECTING THE OUTPUT OF SAID AMPLIFIERS TO BALANCED SIGNALLING APPARATUS, ADMITTING THE GAS TO BE ANALYZED TO ONE SAID PATH ONLY, AND DETERMINING THE PRESENCE OF SO2 BY THE SIGNAL OF THE SIGNALLING APPARATUS.
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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) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |