US2685649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analyzer
Assignee: Phillips Petroleum Co
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Filing: 1952-10-29
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Granted: 1954-08-03
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Expires: 1972-10-29
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/3504
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
THE METHOD OF DETECTING THE PRESENCE OF CARBON DIOXIDE WHICH COMPRISES ESTABLISHING TWO BEAMS OF INFRARED RADIATION OF PREDETERMINED INTENSITY, DIRECTING BOTH OF SAID BEAMS THROUGH A SAMPLE OF MATERIAL UNDER ANALYSIS, DIRECTING ONE OF SAID BEAMS THROUGH A QUARTZ FILTER OF SUFFICIENT THICKNESS TO ABSORB A MAJOR PORTION OF THE TOTAL RADIATION IN SAID ONE BEAM OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS, DIRECTING THE OTHER OF SAID BEAMS THROUGH FILTER MEANT TO TRANSMIT A PREDETERMINED QUANTITY OF RADIATION OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS, THE TRANSMITTED RADIATION OF SAID OTHER BEAM OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS BEING GREATER THAN THE RADIATION OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS TRANSMITTED THROUGH SAID QUARTZ FILTER, AND MEASURING THE RESULTING INTENSITIES OF THE TWO BEAMS WHEREBY CHANGES IN THE RATIO OF INTENSITIES IS INDICATIVE OF CHANGES IN CONCENTRATION OF CARBON DIOXIDE PRESENT IN THE MATERIAL UNDER ANALYSIS.
Claim 2
Independent Claim
153 words
THE METHOD OF DETECTING THE PRESENCE OF CARBON DIOXIDE WHICH COMPRISES ESTABLISHING TWO BEAMS OF INFRARED RADIATION OF PREDETERMINED INTENSITY, DIRECTING BOTH OF SAID BEAMS THROUGH A SAMPLE OF MATERIAL UNDER ANALYSIS, DIRECTING ONE OF SAID BEAMS THROUGH A QUARTZ FILTER OF SUFFICIENT THICKNESS TO ABSORB A MAJOR PORTION OF THE TOTAL RADIATION IN SAID ONE BEAM OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS, DIRECTING THE OTHER OF SAID BEAMS THROUGH FILTER MEANT TO TRANSMIT A PREDETERMINED QUANTITY OF RADIATION OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS, THE TRANSMITTED RADIATION OF SAID OTHER BEAM OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS BEING GREATER THAN THE RADIATION OF WAVE LENGTHS LONGER THAN APPROXIMATELY 4.25 MICRONS TRANSMITTED THROUGH SAID QUARTZ FILTER, AND MEASURING THE RESULTING INTENSITIES OF THE TWO BEAMS WHEREBY CHANGES IN THE RATIO OF INTENSITIES IS INDICATIVE OF CHANGES IN CONCENTRATION OF CARBON DIOXIDE PRESENT IN THE MATERIAL UNDER ANALYSIS.
References Cited (Backward Citations)
US2621297A
Cited
US2579825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |