Patent US2300052A successfully refreshed from Google Patents.
Patent US1977559A successfully refreshed from Google Patents.
US1977559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cupola operation
Assignee: Schneider Electric Systems USA Inc
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Filing: 1933-05-03
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Granted: 1934-10-16
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Expires: 1953-05-03
Abstract
No abstract record available.
Inventors
- 👤 Sidney R Lewis
- 👤 Leland K Spink
- 👤 Byron W Hagerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-10-15 | 1938-04-16 | 1938-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-15 | 1942-04-16 | 1942-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-15 | 1946-04-16 | 1946-10-16 | $7700.00 | Window Closed / Lapsed |