US2532716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double tube core barrel for core drilling
Assignee: GERBEN MEIDEMA
•
Filing: 1947-11-28
•
Granted: 1950-12-05
•
Expires: 1967-11-28
Abstract
No abstract record available.
Inventors
- 👤 Jesse L Havlick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
E; E21; E21B; E21B25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE18045E
Cited
GB191405300A
Cited
US1611504A
Cited
US1853581A
Cited
DE608248C
Cited
US2001764A
Cited
US1903232A
Cited
US2040889A
Cited
US1994848A
Cited
US2260678A
Cited
US2422955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |