US2609837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust damper
Assignee: Smith & Enander
•
Filing: 1947-03-24
•
Granted: 1952-09-09
•
Expires: 1967-03-24
Abstract
No abstract record available.
Inventors
- 👤 Arthur G Enander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:39
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/16; F01N1/165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US768393A
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US810542A
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US1211237A
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US1615147A
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US1870557A
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US2271138A
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US2444101A
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US2530095A
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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) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |