Patent US3087425A successfully refreshed from Google Patents.
US3087425A
Expired / Lapsed
US
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Expansible explosive unit for use in wet boreholes
Assignee: Individual
•
Filing: 1961-11-30
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Granted: 1963-04-30
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Expires: 1981-11-30
Abstract
No abstract record available.
Inventors
- 👤 Jr George L Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:23
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/087
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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |