US2527291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas pressure blasting device
Assignee: ARMSTRONG COALBREAK Co
•
Filing: 1947-11-24
•
Granted: 1950-10-24
•
Expires: 1967-11-24
Abstract
No abstract record available.
Inventors
- 👤 Frank H Armstrong
- 👤 Jr Edward C Filstrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:48
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/04; F42B3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2083734A
Cited
US2083736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |