US2990166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining method
Assignee: Individual
•
Filing: 1957-08-29
•
Granted: 1961-06-27
•
Expires: 1977-08-29
Abstract
No abstract record available.
Inventors
- 👤 Myles A Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:09
CPC Classifications
E; E21; E21C; E21C41/00; E21C41/16; E21D; E21D15/00; E21D15/48; E21D15/483; E21D23/00; E21D23/0004; E21D23/0017; E21D23/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE476792C
Cited
US1752101A
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US2140325A
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US2211243A
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US2226201A
Cited
GB512197A
Cited
US2714011A
Cited
US2753036A
Cited
US2756034A
Cited
US2861429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |