Patent US3057700A successfully refreshed from Google Patents.
US945831A
Expired / Lapsed
US
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Automatic draft-regulator for furnaces.
Assignee: Individual
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Filing: 1908-12-30
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Granted: 1910-01-11
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Expires: 1928-12-30
Abstract
No abstract record available.
Inventors
- 👤 Herman F Westphal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:52
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/12; 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) | 1913-01-10 | 1913-07-12 | 1914-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1917-01-10 | 1917-07-12 | 1918-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1921-01-10 | 1921-07-12 | 1922-01-11 | $7700.00 | Window Closed / Lapsed |