US1585358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for purifying mines, tunnels, and subways
Assignee: Individual
•
Filing: 1924-09-24
•
Granted: 1926-05-18
•
Expires: 1944-09-24
Abstract
No abstract record available.
Inventors
- 👤 George A Arkwright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:40
CPC Classifications
E; E21; E21F; E21F5/00; E21F5/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1929-05-17 | 1929-11-16 | 1930-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-05-17 | 1933-11-16 | 1934-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-05-17 | 1937-11-16 | 1938-05-18 | $7700.00 | Window Closed / Lapsed |