US2469287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory element for electric heaters
Assignee: Individual
•
Filing: 1945-10-10
•
Granted: 1949-05-03
•
Expires: 1965-10-10
Abstract
No abstract record available.
Inventors
- 👤 Yokel Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:36
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1475162A
Cited
US1614321A
Cited
US1555334A
Cited
US1617916A
Cited
US1662771A
Cited
US1935163A
Cited
US1997146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |