Patent US3486570A successfully refreshed from Google Patents.
US3486570A
Expired / Lapsed
US
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Alluvial prospecting units
Assignee: ALLUVIAL MINING AND SHAFT SINKING CO Ltd
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Filing: 1967-05-15
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Granted: 1969-12-30
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Expires: 1987-05-15
Abstract
No abstract record available.
Inventors
- 👤 Henry John Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:18
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/02; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9212; E02F3/9218; E02F3/9287; E21B7/00; E21B7/12; E21B7/128; E21B7/18; E21B7/185; E21B7/20
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) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |