Patent US1698989A successfully refreshed from Google Patents.
US1698989A
Expired / Lapsed
US
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Automatic-control mechanism for dampers and the like
Assignee: Perfection Stove Co
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Filing: 1925-05-18
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Granted: 1929-01-15
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Expires: 1945-05-18
Abstract
No abstract record available.
Inventors
- 👤 Lee S Chadwick
- 👤 Resek Marc
- 👤 Dahlstrom John Alger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:52
CPC Classifications
F; F23; F23N; F23N3/00; F23N3/02
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) | 1932-01-15 | 1932-07-16 | 1933-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-01-15 | 1936-07-16 | 1937-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-01-15 | 1940-07-16 | 1941-01-15 | $7700.00 | Window Closed / Lapsed |