Patent US2895299A successfully refreshed from Google Patents.
US2895299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of constructing tunnels
Assignee: American Marietta Co
•
Filing: 1955-06-24
•
Granted: 1959-07-21
•
Expires: 1975-06-24
Abstract
No abstract record available.
Inventors
- 👤 Edward P Washabaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:30
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/04; E21D11/08; E21D11/40; Y; Y10; Y10S; Y10S414/00; Y10S414/123
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US168146A
Cited
US1195147A
Cited
US1642559A
Cited
US1638428A
Cited
US1814852A
Cited
US2172030A
Cited
GB506453A
Cited
GB514793A
Cited
US2230032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |