US2632836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well heater
Assignee: THERMACTOR Co
•
Filing: 1949-11-08
•
Granted: 1953-03-24
•
Expires: 1969-11-08
Abstract
No abstract record available.
Inventors
- 👤 Charles S Ackley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/023; E21B17/026; E21B36/00; E21B36/04
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |