US2831439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampling pump for use in bore holes
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1953-11-27
•
Granted: 1958-04-22
•
Expires: 1973-11-27
Abstract
No abstract record available.
Inventors
- 👤 Robert H Blood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:56
CPC Classifications
E; E21; E21B; E21B49/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US532025A
Cited
US789567A
Cited
US1603188A
Cited
US1713808A
Cited
US2083714A
Cited
US2402886A
Cited
US2511759A
Cited
US2600173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |