Patent US783824A successfully refreshed from Google Patents.
US804677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-purifier.
Assignee: Individual
•
Filing: 1905-05-09
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Granted: 1905-11-14
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Expires: 1925-05-09
Abstract
No abstract record available.
Inventors
- 👤 Axel Sahlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:28
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/30; B01F; B01F27/00; B01F27/05; B01F27/09; B01F27/091; Y; Y10; Y10S; Y10S261/00; Y10S261/09
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) | 1908-11-13 | 1909-05-15 | 1909-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-11-13 | 1913-05-15 | 1913-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-11-13 | 1917-05-15 | 1917-11-14 | $7700.00 | Window Closed / Lapsed |