US3169376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subterranean tunnel liner installation
Assignee: Individual
•
Filing: 1961-08-25
•
Granted: 1965-02-16
•
Expires: 1981-08-25
Abstract
No abstract record available.
Inventors
- 👤 Wesley B Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/04; E21D11/10; E21D9/00; E21D9/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN AN APPARATUS FOR USE IN A SYSTEM FOR THE INSTALLATION OF SUBTERRANEAN TUNNEL LINING ELEMENTS ARRANGED IN AN END-TO-END STRING, THE APPARATUS BEING OF THE TYPE ADAPTED FOR MOVEMENT OF THE LINING ELEMENT IN ONE-BYONE SEQUENTIAL ORDER, THE APPARATUS INCLUDING EXPANDABLE, ANNULAR TUBES INTERPOSED BETWEEN SAID LINING ELEMENT, FLUID PRESSURE MEANS OPERATIVELY INTERCONNECTING THE TUBES FOR EFFECTING THE EXPANSION THEREOF, AND VALVE MEANS OPERATIVELY CONNECTED TO EACH OF THE TUBES AND TO THE FLUID PRESSURE MEANS; THAT IMPROVEMENT WHICH COMPRISES: EACH
Claim 2
Dependent Claim
82 words
IN AN APPARATUS FOR USE IN A SYSTEM FOR THE INSTALLATION OF SUBTERRANEAN TUNNEL LINING ELEMENTS ARRANGED IN AN END-TO-END STRING, THE APPARATUS BEING OF THE TYPE ADAPTED FOR MOVEMENT OF THE LINING ELEMENT IN ONE-BYONE SEQUENTIAL ORDER, THE APPARATUS INCLUDING EXPANDABLE, ANNULAR TUBES INTERPOSED BETWEEN SAID LINING ELEMENT, FLUID PRESSURE MEANS OPERATIVELY INTERCONNECTING THE TUBES FOR EFFECTING THE EXPANSION THEREOF, AND VALVE MEANS OPERATIVELY CONNECTED TO EACH OF THE TUBES AND TO THE FLUID PRESSURE MEANS; THAT IMPROVEMENT WHICH COMPRISES: EACH
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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) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |