US2525314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric oil well tubing heater
Assignee: Individual
•
Filing: 1946-05-10
•
Granted: 1950-10-10
•
Expires: 1966-05-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Rial
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:58
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1915895A
Cited
US2083799A
Cited
US2202034A
Cited
US2244256A
Cited
US2268978A
Cited
US2302774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |