Patent US2641239A successfully refreshed from Google Patents.
US2641239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical head bolt replacement heater for liquid cooled internal-combustion engines
Assignee: PHILLIPS Mfg CO Inc
•
Filing: 1951-06-14
•
Granted: 1953-06-09
•
Expires: 1971-06-14
Abstract
No abstract record available.
Inventors
- 👤 George H Grinde
- 👤 Louis L Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:32
CPC Classifications
F; F23; F23Q; F23Q7/00; F23Q7/001
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1220150A
Cited
US1205571A
Cited
US1466686A
Cited
US1360510A
Cited
US1584245A
Cited
US1854072A
Cited
US1746853A
Cited
US1916237A
Cited
US2130365A
Cited
US2176601A
Cited
US2389925A
Cited
US2487326A
Cited
US2611066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |