Patent US2632836A successfully refreshed from Google Patents.
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 19:01
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/023; E21B17/026; E21B36/00; E21B36/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1426407A
Cited
US1457690A
Cited
US758684A
Cited
US965287A
Cited
US1176739A
Cited
US1174444A
Cited
US1576102A
Cited
US1504208A
Cited
US1681523A
Cited
US2076669A
Cited
US1957984A
Cited
US2022977A
Cited
US2047000A
Cited
US2082055A
Cited
US2190824A
Cited
US2166807A
Cited
US2350429A
Cited
US2388899A
Cited
US2484063A
Cited
US2500305A
Cited
US2548360A
Cited
US2587391A
Cited
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 |