US2741544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for fluoride analysis
Assignee: SRI International Inc
•
Filing: 1952-11-01
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Granted: 1956-04-10
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Expires: 1972-11-01
Abstract
No abstract record available.
Inventors
- 👤 Saul W Chaikin
- 👤 Thomas D Parks
- 👤 Clarence I Glassbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:23
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N21/643; G01N21/84; G01N21/8483; G01N2021/6432; G01N21/75; G01N21/77; G01N2021/7769; G01N2021/7786; Y; Y10; Y10T; Y10T436/00; Y10T436/15; Y10T436/153333; Y10T436/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
AN APPARATUS FOR CONTINUOUSLY DETERMINING THE HYDROGEN FLUORIDE CONCENTRATION IN A GAS WHEN PRESENT IN TRACES WHICH COMPRISES A QUENCHING CHAMBER, A FLUORESCING CHAMBER, A MOVABLE STRIP SENSITIZED WITH A FLUORESCING AGENT QUENCHABLE BY HYDROGEN FLUORIDE, MEANS FOR PASSING SAID STRIP AT A UNIFORM RATE THROUGH SAID QUENCHING CHAMBER AND THEN THROUGH SAID FLUORESCING CHAMBER, MEANS FOR INTRODUCING SAID GAS INTO SAID QUENCHING CHAMBER AT A UNIFORM RATE, MEANS FOR RADIATING SAID STRIP IN SAID FLUORESCING CHAMBER WITH EXCITING LIGHT, AND A PHOTOMETER POSITIONED TO REACT TO EMITTED LIGHT FROM SAID STRIP IN SAID FLUORESCING CHAMBER, SAID PHOTOMETER BEING SENSITIVE TO LIGHT EMITTED BY SAID STRIP AND INSENSITIVE TO SAID EXCITING LIGHT.
Claim 2
Independent Claim
112 words
AN APPARATUS FOR CONTINUOUSLY DETERMINING THE HYDROGEN FLUORIDE CONCENTRATION IN A GAS WHEN PRESENT IN TRACES WHICH COMPRISES A QUENCHING CHAMBER, A FLUORESCING CHAMBER, A MOVABLE STRIP SENSITIZED WITH A FLUORESCING AGENT QUENCHABLE BY HYDROGEN FLUORIDE, MEANS FOR PASSING SAID STRIP AT A UNIFORM RATE THROUGH SAID QUENCHING CHAMBER AND THEN THROUGH SAID FLUORESCING CHAMBER, MEANS FOR INTRODUCING SAID GAS INTO SAID QUENCHING CHAMBER AT A UNIFORM RATE, MEANS FOR RADIATING SAID STRIP IN SAID FLUORESCING CHAMBER WITH EXCITING LIGHT, AND A PHOTOMETER POSITIONED TO REACT TO EMITTED LIGHT FROM SAID STRIP IN SAID FLUORESCING CHAMBER, SAID PHOTOMETER BEING SENSITIVE TO LIGHT EMITTED BY SAID STRIP AND INSENSITIVE TO SAID EXCITING LIGHT.
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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) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |