US3075591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel boring machines
Assignee: Economic Foundations Ltd
•
Filing: 1959-07-24
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Granted: 1963-01-29
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Expires: 1979-07-24
Abstract
No abstract record available.
Inventors
- 👤 Pirrie Norman Duncan
- 👤 Amann Gustav Wolfgang
- 👤 Woolgar Reginald John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:06
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/06; E21D9/08; E21D9/0875; E21D9/0879
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A TUNNEL BORING MACHINE COMPRISING AN ANNULAR NONROTATING SHIELD, A HEAD LOCATED AT ONE END OF SAID SHIELD, AN ANNULUS COAXIAL WITH AND FIXEDLY CARRIED BY THE HEAD, SAID ANNULUS DEFINING THE PERIPHERAL EXTREMITY OF THE OUTER FACE OF THE HEAD, SAID ANNULUS PROVIDING A CHANNEL SECTION FACING INWARDLY OF SAID ANNULUS FOR RECEIVING CUTTINGS, MEANS SUPPORTED ON THE SHIELD FOR ROTATING THE HEAD RELATIVE TO THE SHIELD ABOUT THE COMMON AXIS THEREOF, TUNNEL FACE CUTTING BLADES OPERATIVELY DISPOSED AT THE OUTER END FACE OF THE HEAD, TUNNEL WALL-CUTTING BLADES RADIALLY SLIDABLY MOUNTED ON THE HEAD AND PROJECTING THROUGH AND BEYOND THE PERIPHERY OF SAID ANNULUS, AND OPERATING MEANS MOUNTED ON THE HEAD FOR MOVING THE WALL-CUTTING BLADES RADIALLY INWARDLY AND OUTWARDLY CYCLICALLY DURING EACH REVOLUTION OF THE HEAD IN TIMED RELATION WITH THE ROTATION OF THE HEAD.
Claim 2
Dependent Claim
138 words
A TUNNEL BORING MACHINE COMPRISING AN ANNULAR NONROTATING SHIELD, A HEAD LOCATED AT ONE END OF SAID SHIELD, AN ANNULUS COAXIAL WITH AND FIXEDLY CARRIED BY THE HEAD, SAID ANNULUS DEFINING THE PERIPHERAL EXTREMITY OF THE OUTER FACE OF THE HEAD, SAID ANNULUS PROVIDING A CHANNEL SECTION FACING INWARDLY OF SAID ANNULUS FOR RECEIVING CUTTINGS, MEANS SUPPORTED ON THE SHIELD FOR ROTATING THE HEAD RELATIVE TO THE SHIELD ABOUT THE COMMON AXIS THEREOF, TUNNEL FACE CUTTING BLADES OPERATIVELY DISPOSED AT THE OUTER END FACE OF THE HEAD, TUNNEL WALL-CUTTING BLADES RADIALLY SLIDABLY MOUNTED ON THE HEAD AND PROJECTING THROUGH AND BEYOND THE PERIPHERY OF SAID ANNULUS, AND OPERATING MEANS MOUNTED ON THE HEAD FOR MOVING THE WALL-CUTTING BLADES RADIALLY INWARDLY AND OUTWARDLY CYCLICALLY DURING EACH REVOLUTION OF THE HEAD IN TIMED RELATION WITH THE ROTATION OF THE HEAD.
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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) | 1966-01-28 | 1966-07-30 | 1967-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-28 | 1970-07-30 | 1971-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-28 | 1974-07-30 | 1975-01-29 | $7700.00 | Window Closed / Lapsed |