US2561802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detection of toxic gases, especially carbon monoxide
Assignee: Stewart Warner Corp
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Filing: 1948-07-15
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Granted: 1951-07-24
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Expires: 1968-07-15
Abstract
No abstract record available.
Inventors
- 👤 Charles W Klug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:26
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/783; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998; Y10T436/205831
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
AN APPARATUS FOR DETECTING THE PRESENCE OF A GAS CONSTITUENT IN A GASEOUS MEDIUM BY THE USE OF A SUBSTANCE IN GAS PERMEABLE FORM, WHICH UNDERGOES A PHOTOCHARACTERISTIC CHANGE IN THE PRESENCE OF SAID CONSTITUENT, SAID APPARATUS COMPRISING: A LIGHT TRANSMITTING CONTAINER CONSTRUCTED TO SUPPORT SAID SUBSTANCE FOR PASSAGE OF GAS THERETHROUGH, A CONDUIT CONNECTED TO SAID CONTAINER FOR CONDUCTING THE MEDIUM TO BE TESTED TO SAID CONTAINER, A RESTORING GAS GENERATOR IN SAID CONDUIT TO GENERATE A RESTORING GAS WHEN ENERGIZED, A LAMP AND A PHOTOELECTRIC CELL ARRANGED TO RECEIVE LIGHT FROM THE LAMP THROUGH THE CONTAINER, AND MEANS OPERATED BY SAID PHOTOELECTRIC CELL FOR ENERGIZING SAID GENERATOR WHEN THE LIGHT RECEIVED BY SAID CELL DROPS TO A PREDETERMINED LEVEL.
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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) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |