US2681795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampling sub with removable cutting collector
Assignee: Shell Development Co
•
Filing: 1950-08-14
•
Granted: 1954-06-22
•
Expires: 1970-08-14
Abstract
No abstract record available.
Inventors
- 👤 James N Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:11
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1003874A
Cited
US1753339A
Cited
US2209262A
Cited
US2347726A
Cited
US2332267A
Cited
US2544623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |