Patent US807666A successfully refreshed from Google Patents.
US807666A
Expired / Lapsed
US
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Apparatus for respiring within spaces full of smoke or noxious gases.
Assignee: Individual
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Filing: 1904-05-23
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Granted: 1905-12-19
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Expires: 1924-05-23
Abstract
No abstract record available.
Inventors
- 👤 Johann Heinrich Draeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:24
CPC Classifications
A; A62; A62B; A62B17/00; A62B17/04
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) | 1908-12-18 | 1909-06-19 | 1909-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-12-18 | 1913-06-19 | 1913-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-12-18 | 1917-06-19 | 1917-12-19 | $7700.00 | Window Closed / Lapsed |