Patent US3091690A successfully refreshed from Google Patents.
US3091690A
Expired / Lapsed
US
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Two path infrared gas analyzer having one enclosed path
Assignee: Barnes Engineering Co
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Filing: 1960-06-16
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Granted: 1963-05-28
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Expires: 1980-06-16
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Mchenry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:57
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/3504; G01N21/314
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
AN INFRARED GAS ANALYZER COMPRISING IN COMBINATION AND IN OPTICAL ALIGNMENT, (A) A SOURCE OF INFRARED RADIATION, (B) TWO PATHS, AT LEST ONE OF THEM BEING ENCLOSED, SAID PATHS BEING OF EQUAL EFFECTIVE CROSS SECTION AND CAPABLE OF HAVING DIFFERING GAS COMPOSITIONS, (C) MEANS FOR FORMING BEAMS FROM SAID INFRARED SOURCE AND FOR DIRECTING THEM THROUGH SAID PATHS, (D) AN INFRARED DETECTOR AND TWO FILTERING MEANS ONE OF WHICH PASSES A BRAND OF INFRARED RADIATION CONTAINING A STRONG ABSORPTION BAND OF A PREDETERMINED CHEMICAL CAPABLE OF EXISTING IN THE VAPOR PHASE, (E) MEANS FOR IMAGING THE TWO BEAMS ALTERNATELY THROUGH EACH FILTER ONTO THE DETECTOR AT A PREDETERMINED ALTERNATING FREQUENCY AND A.C. RESPONSIVE INDICATING MEANS CONNECTED TO THE OUTPUT OF SAID DETECTOR AND RESPONSIVE TO THE FREQUENCIES OF SAID ALTERNATION OF THE BEAMS.
Claim 2
Dependent Claim
133 words
AN INFRARED GAS ANALYZER COMPRISING IN COMBINATION AND IN OPTICAL ALIGNMENT, (A) A SOURCE OF INFRARED RADIATION, (B) TWO PATHS, AT LEST ONE OF THEM BEING ENCLOSED, SAID PATHS BEING OF EQUAL EFFECTIVE CROSS SECTION AND CAPABLE OF HAVING DIFFERING GAS COMPOSITIONS, (C) MEANS FOR FORMING BEAMS FROM SAID INFRARED SOURCE AND FOR DIRECTING THEM THROUGH SAID PATHS, (D) AN INFRARED DETECTOR AND TWO FILTERING MEANS ONE OF WHICH PASSES A BRAND OF INFRARED RADIATION CONTAINING A STRONG ABSORPTION BAND OF A PREDETERMINED CHEMICAL CAPABLE OF EXISTING IN THE VAPOR PHASE, (E) MEANS FOR IMAGING THE TWO BEAMS ALTERNATELY THROUGH EACH FILTER ONTO THE DETECTOR AT A PREDETERMINED ALTERNATING FREQUENCY AND A.C. RESPONSIVE INDICATING MEANS CONNECTED TO THE OUTPUT OF SAID DETECTOR AND RESPONSIVE TO THE FREQUENCIES OF SAID ALTERNATION OF THE BEAMS.
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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) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |