US2476845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid for drilling wells
Assignee: Shell Development Co
•
Filing: 1946-06-07
•
Granted: 1949-07-19
•
Expires: 1966-06-07
Abstract
No abstract record available.
Inventors
- 👤 Reginald D Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:12
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1107020A
Cited
US1201301A
Cited
US1444844A
Cited
US1450685A
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US1895775A
Cited
US2151029A
Cited
US2343860A
Cited
US2380156A
Cited
US2360992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |