US2644669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile drilling apparatus
Assignee: Joy Manufacturing Co
•
Filing: 1950-01-20
•
Granted: 1953-07-07
•
Expires: 1970-01-20
Abstract
No abstract record available.
Inventors
- 👤 John C Curtis
- 👤 Harold F Minnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:35
CPC Classifications
E; E21; E21D; E21D20/00; E21D20/003; E21B; E21B19/00; E21B19/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1098014A
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US1367042A
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US1403711A
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US1595922A
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US1850403A
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US2123897A
Cited
US2165666A
Cited
US2197790A
Cited
US2198016A
Cited
US2516421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |