US3301598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel boring machine having rotation control responsive to advance pressure
Assignee: Economic Foundations Ltd
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Filing: 1965-11-12
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Granted: 1967-01-31
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Expires: 1985-11-12
Abstract
No abstract record available.
Inventors
- 👤 Pirrie Norman Duncan
- 👤 Bland John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:17
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/06; E21D9/093; E21D9/08; E21D9/0875; E21D9/0879
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A TUNNEL BORING MACHINE OF THE KIND COMPRISING A SHIELD, A CUTTING HEAD MOUNTED ON THE SHIELD FOR ROTATION RELATIVE THERETO AND FOR AXIAL MOVEMENT THEREWITH, A FIRST HYDRAULIC SYSTEM ACTING BETWEEN THE SHIELD AND TUNNEL FOR ADVANCING THE CUTTING HEAD ALONG THE TUNNEL AS TUNNELLING PROCEEDS, A SECOND HYDRAULIC SYSTEM COMPRISING HYDRAULIC MOTORS MOUNTED ON THE SHIELD AND OPERABLE TO ROTATE THE CUTTING HEAD, AND HYDRAULIC FLUID CONTROL MEANS OPERABLE IN RESPONSE TO A PREDETERMINED HYDROSTATIC PRESSURE IN THE SECOND SYSTEM TO UNLOAD THE FIRST SYSTEM.
Claim 2
Dependent Claim
87 words
A TUNNEL BORING MACHINE OF THE KIND COMPRISING A SHIELD, A CUTTING HEAD MOUNTED ON THE SHIELD FOR ROTATION RELATIVE THERETO AND FOR AXIAL MOVEMENT THEREWITH, A FIRST HYDRAULIC SYSTEM ACTING BETWEEN THE SHIELD AND TUNNEL FOR ADVANCING THE CUTTING HEAD ALONG THE TUNNEL AS TUNNELLING PROCEEDS, A SECOND HYDRAULIC SYSTEM COMPRISING HYDRAULIC MOTORS MOUNTED ON THE SHIELD AND OPERABLE TO ROTATE THE CUTTING HEAD, AND HYDRAULIC FLUID CONTROL MEANS OPERABLE IN RESPONSE TO A PREDETERMINED HYDROSTATIC PRESSURE IN THE SECOND SYSTEM TO UNLOAD THE FIRST SYSTEM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |