Patent US2496569A successfully refreshed from Google Patents.
US2496569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wash pipe for rotary swivels
Assignee: Emsco Derrick and Equipment Co
•
Filing: 1945-05-09
•
Granted: 1950-02-07
•
Expires: 1965-05-09
Abstract
No abstract record available.
Inventors
- 👤 Guglielmo R Tremolada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:17
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/02; F; F16; F16L; F16L27/00; F16L27/08
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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |