Patent US2189684A successfully refreshed from Google Patents.
US2189684A
Expired / Lapsed
US
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Smoke cooling device
Assignee: Individual
•
Filing: 1938-11-05
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Granted: 1940-02-06
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Expires: 1958-11-05
Abstract
No abstract record available.
Inventors
- 👤 Sprinkel Henry Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:02
CPC Classifications
A; A24; A24F; A24F1/00; A24F1/02; A24F1/22
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) | 1943-02-05 | 1943-08-07 | 1944-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-05 | 1947-08-07 | 1948-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-05 | 1951-08-07 | 1952-02-06 | $7700.00 | Window Closed / Lapsed |