Patent US2489180A successfully refreshed from Google Patents.
US2489180A
Expired / Lapsed
US
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Method of detecting gas in well drilling fluids
Assignee: Individual
•
Filing: 1939-04-01
•
Granted: 1949-11-22
•
Expires: 1959-04-01
Abstract
No abstract record available.
Inventors
- 👤 John T Hayward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:15
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; E; E21; E21B; E21B21/00; E21B21/01; E21B49/00; E21B49/005
Claims Analysis
Total Claims: 0
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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) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |