Patent US2491210A successfully refreshed from Google Patents.
US2491210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube furnace for producing metal
Assignee: Westinghouse Electric Corp
•
Filing: 1945-11-24
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Granted: 1949-12-13
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Expires: 1965-11-24
Abstract
No abstract record available.
Inventors
- 👤 Rennie Robert Fredrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:06
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/34; F; F27; F27B; F27B5/00; F27B5/04; Y; Y10; Y10S; Y10S266/00; Y10S266/905
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) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |