US2466709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunneling machine
Assignee: Individual
•
Filing: 1944-10-02
•
Granted: 1949-04-12
•
Expires: 1964-10-02
Abstract
No abstract record available.
Inventors
- 👤 Richard D Karr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:03
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/11; E21D9/116; E21D9/117; E21D9/06; E21D9/08; E21D9/0875; E21D9/0879; E21D9/093
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1284398A
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US1453620A
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US1523912A
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US1882545A
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US2061657A
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US2034072A
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US2124521A
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US2217292A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-11 | 1952-10-11 | 1953-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-11 | 1956-10-11 | 1957-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-11 | 1960-10-11 | 1961-04-12 | $7700.00 | Window Closed / Lapsed |