US2491579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance furnace
Assignee: Revere Copper and Brass Inc
•
Filing: 1945-05-24
•
Granted: 1949-12-20
•
Expires: 1965-05-24
Abstract
No abstract record available.
Inventors
- 👤 Frank F Poland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:03
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/60; F; F27; F27D; F27D11/00; F27D11/02; H05B3/62; H05B3/64
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) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |