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Patent US3510168A successfully refreshed from Google Patents.
US3510168A
Expired / Lapsed
US
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Method of mining bituminous tar sands
Assignee: Great Canadian Oil Sands Ltd
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Filing: 1968-07-03
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Granted: 1970-05-05
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Expires: 1988-07-03
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Camp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:53
CPC Classifications
E; E21; E21C; E21C41/00; E21C41/26; E21C41/31; B; B03; B03B; B03B9/00; B03B9/02
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) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |