US3138933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for driving a tunnel through and supporting earth structure
Assignee: Individual
•
Filing: 1957-08-19
•
Granted: 1964-06-30
•
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 03:06
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.
References Cited (Backward Citations)
DE311303C
Cited
DE94217C
Cited
US427339A
Cited
US498855A
Cited
US810428A
Cited
US1100142A
Cited
US1353274A
Cited
US1896439A
Cited
US1855466A
Cited
FR768071A
Cited
US2139563A
Cited
US2264100A
Cited
US2328779A
Cited
DE910770C
Cited
US2758467A
Cited
GB719170A
Cited
AT185332B
Cited
US2757515A
Cited
US2997853A
Cited
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 |