Patent US3138933A successfully refreshed from Google Patents.
US3138933A
Expired / Lapsed
US
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Method of and apparatus for driving a tunnel through and supporting earth structure
Assignee: Individual
•
Filing: 1957-08-19
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Granted: 1964-06-30
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Expires: 1977-08-19
Abstract
No abstract record available.
Inventors
- 👤 Kemper Maxwell Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:13
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/06; E21D11/00; E21D11/04; E21D11/10; E21D19/00; E21D19/04; E21D23/00; E21D23/0086; E21D23/0095; E21D9/04; E21D9/0642; E21D9/065; E21D9/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE METHOD OF DRIVING A TUNNEL IN THE EARTH COMPRISING: DRIVING A SHIELD INTO THE EARTH; REMOVING THE EARTH FROM THE SHIELD AT THE TUNNEL FACE; CONSTRUCTING A REINFORCING STRUCTURE WITHIN THE SHIELD WHILE SUPPORTING THE OVERLYING EARTH ON THE SHIELD; ADVANCING THE SHIELD TO EXPOSE THE REINFORCING STRUCTURE; SUPPORTING THE OVERLYING EARTH ON THE REINFORCING STRUCTURE; DRIVING THE SHIELD WITH A PLURALITY OF SUBSTANTIALLY IDENTICAL SPACED HYDRAULIC FLUID RAMS; AND FORCING EQUAL VOLUMES OF HYDRAULIC FLUID INTO EACH OF SAID RAMS FROM A SEPARATE SOURCE OF HYDRAULIC FLUID UNDER PRESSURE FOR EACH RAM.
Claim 2
Independent Claim
94 words
THE METHOD OF DRIVING A TUNNEL IN THE EARTH COMPRISING: DRIVING A SHIELD INTO THE EARTH; REMOVING THE EARTH FROM THE SHIELD AT THE TUNNEL FACE; CONSTRUCTING A REINFORCING STRUCTURE WITHIN THE SHIELD WHILE SUPPORTING THE OVERLYING EARTH ON THE SHIELD; ADVANCING THE SHIELD TO EXPOSE THE REINFORCING STRUCTURE; SUPPORTING THE OVERLYING EARTH ON THE REINFORCING STRUCTURE; DRIVING THE SHIELD WITH A PLURALITY OF SUBSTANTIALLY IDENTICAL SPACED HYDRAULIC FLUID RAMS; AND FORCING EQUAL VOLUMES OF HYDRAULIC FLUID INTO EACH OF SAID RAMS FROM A SEPARATE SOURCE OF HYDRAULIC FLUID UNDER PRESSURE FOR EACH RAM.
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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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |