US871652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-purifier.
Assignee: Individual
•
Filing: 1906-08-23
•
Granted: 1907-11-19
•
Expires: 1926-08-23
Abstract
No abstract record available.
Inventors
- 👤 Frank A Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:22
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/10; C01B13/11
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) | 1910-11-18 | 1911-05-20 | 1911-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-11-18 | 1915-05-20 | 1915-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-11-18 | 1919-05-20 | 1919-11-19 | $7700.00 | Window Closed / Lapsed |