US2413261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for hydrogen sulfide determination
Assignee: United Gas Improvement Co
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Filing: 1939-11-30
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Granted: 1946-12-24
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Expires: 1959-11-30
Abstract
No abstract record available.
Inventors
- 👤 Wilton E Stackhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:57
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/783; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/117497; Y10T436/18; Y10T436/182; Y10T436/184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-12-23 | 1950-06-24 | 1950-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-12-23 | 1954-06-24 | 1954-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-12-23 | 1958-06-24 | 1958-12-24 | $7700.00 | Window Closed / Lapsed |