US2541346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace volume control
Assignee: HART AND COOLEY Manufacturing CO
•
Filing: 1948-01-02
•
Granted: 1951-02-13
•
Expires: 1968-01-02
Abstract
No abstract record available.
Inventors
- 👤 Roo William C De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:25
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426; F24F2013/1473
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US814888A
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US1399985A
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US1769931A
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US1771014A
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US2439444A
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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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |