Patent US2740398A successfully refreshed from Google Patents.
US2740398A
Expired / Lapsed
US
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Fireplace draft mechanism
Assignee: Individual
•
Filing: 1952-11-28
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Granted: 1956-04-03
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Expires: 1972-11-28
Abstract
No abstract record available.
Inventors
- 👤 Lawrence W Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:46
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/189; F24B1/1895
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US105297A
Cited
US161724A
Cited
US219530A
Cited
US656895A
Cited
US1702710A
Cited
US2409731A
Cited
US2470430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |