US3022023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shuttle car for mines
Assignee: W H BALLARD II
•
Filing: 1958-12-23
•
Granted: 1962-02-20
•
Expires: 1978-12-23
Abstract
No abstract record available.
Inventors
- 👤 Bernard W Warf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:20
CPC Classifications
E; E21; E21F; E21F13/00; E21F13/02; E21F13/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1644237A
Cited
US2203435A
Cited
US2121916A
Cited
US2472860A
Cited
US2633309A
Cited
FR1089981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |