US3433348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for conveying coal in mines
Assignee: Individual
•
Filing: 1967-04-14
•
Granted: 1969-03-18
•
Expires: 1987-04-14
Abstract
No abstract record available.
Inventors
- 👤 Gordon Bertram Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:33
CPC Classifications
E; E21; E21F; E21F13/00; E21F13/06; E21F13/066; B; B65; B65G; B65G21/00; B65G21/10; B65G21/105; B65G21/14; B65G37/00; B65G2201/00; B65G2201/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE959986C
Cited
US3314525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |