Patent US663837A successfully refreshed from Google Patents.
US663837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-purifier.
Assignee: JAY MILTON BOWERS
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Filing: 1900-04-20
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Granted: 1900-12-11
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Expires: 1920-04-20
Abstract
No abstract record available.
Inventors
- 👤 Appius C Swain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:04
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; A; A62; A62C; A62C5/00; A62C5/02
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) | 1903-12-11 | 1904-06-11 | 1904-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-12-11 | 1908-06-11 | 1908-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-12-11 | 1912-06-11 | 1912-12-11 | $7700.00 | Window Closed / Lapsed |