US3561223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunneling machine with concrete wall forming mechanism
Assignee: Individual
•
Filing: 1968-07-09
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Granted: 1971-02-09
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Expires: 1988-07-09
Abstract
Abstract THIS DISCLOSURE RELATES TO A TUNNELING MACHINE WHICH HAS A SHIELD WITH A ROTARY EXCAVATING WHEEL TO EXCAVATE A TUNNEL, A MECHANISM FOR FORMING A TUBULAR CONCRETE TUNNEL LINING OR WALL AGAINST THE TUNNEL SIDES. THE MACHINE HAS AN ELONGATED TRUSS WHICH TRAILS BEHIND THE SHEILD AND WHICH CARRIES A SPOIL REMOVING CONVEYOR AND A FLUID CONCRETE SUPPLYING CONVEYOR. THE TRUSS ALSO CONSTITUTES A TRACK FOR A CONCRETE FORM HANDLER FOR TRANSFERRING FORMS FROM THE TAIL END OF THE TRUSS TO THE HEAD END AND FOR LINING THE TUNNEL WITH SUCH FORMS.
Inventors
- 👤 John R Tabor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/12; E21D9/13; E21D9/06; E21D9/08; E21D9/087; E21D9/0873
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |