US2521888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine duster
Assignee: Individual
•
Filing: 1948-03-26
•
Granted: 1950-09-12
•
Expires: 1968-03-26
Abstract
No abstract record available.
Inventors
- 👤 John O Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:26
CPC Classifications
E; E21; E21F; E21F5/00; E21F5/08; E21F5/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US18083A
Cited
US1019609A
Cited
US1011071A
Cited
US1616303A
Cited
US1613988A
Cited
GB345992A
Cited
US2159670A
Cited
US2200165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |