US2995901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for lining tunnels with concrete
Assignee: Individual
•
Filing: 1953-03-27
•
Granted: 1961-08-15
•
Expires: 1973-03-27
Abstract
No abstract record available.
Inventors
- 👤 Maxwell F Kemper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:11
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/04; E21D11/10; E21D11/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1235233A
Cited
US1716125A
Cited
US1867837A
Cited
US1751147A
Cited
US2144013A
Cited
US2660034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |