US2703528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blasting process
Assignee: MAUMEE COLLIERIES Co
•
Filing: 1953-11-05
•
Granted: 1955-03-08
•
Expires: 1973-11-05
Abstract
No abstract record available.
Inventors
- 👤 Hugh B Lee
- 👤 Robert L Akre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:04
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/087; F42B3/28; F42D; F42D1/00; F42D1/08; Y; Y10; Y10S; Y10S149/00; Y10S149/11; Y10S149/112
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-07 | 1958-09-06 | 1959-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-07 | 1962-09-06 | 1963-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-07 | 1966-09-06 | 1967-03-08 | $7700.00 | Window Closed / Lapsed |