Patent US6470231B1 successfully refreshed from Google Patents.
US2814979A
Expired / Lapsed
US
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Smoke exhaust apparatus
Assignee: CANYON SWI Inc
•
Filing: 1954-08-26
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Granted: 1957-12-03
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Expires: 1974-08-26
Abstract
No abstract record available.
Inventors
- 👤 Jay P Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:00
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F11/00; F24F11/30; F24F11/32; F24F11/33; F24F11/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US677176A
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US1380207A
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US1418732A
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US1785540A
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US1850793A
Cited
US2100785A
Cited
US2263846A
Cited
US2668491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |