Patent US2233212A successfully refreshed from Google Patents.
US2515366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy-duty flexible drill pipe
Assignee: Individual
•
Filing: 1948-05-04
•
Granted: 1950-07-18
•
Expires: 1968-05-04
Abstract
No abstract record available.
Inventors
- 👤 John A Zublin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:17
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B17/00; E21B17/02; E21B17/04; E21B17/046; E21B17/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |