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Patent US1213944A successfully refreshed from Google Patents.
US1213944A
Expired / Lapsed
US
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Furnace draft-regulator.
Assignee: JOHN P CRANGLE
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Filing: 1916-03-09
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Granted: 1917-01-30
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Expires: 1936-03-09
Abstract
No abstract record available.
Inventors
- 👤 Forrest M Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:32
CPC Classifications
F; F23; F23N; F23N3/00; F23N3/04; F23N3/047
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) | 1920-01-30 | 1920-07-31 | 1921-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-01-30 | 1924-07-31 | 1925-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-01-30 | 1928-07-31 | 1929-01-30 | $7700.00 | Window Closed / Lapsed |