US3396543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel liners
Assignee: Commercial Shearing and Stamping Co
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Filing: 1966-03-17
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Granted: 1968-08-13
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Expires: 1986-03-17
Abstract
No abstract record available.
Inventors
- 👤 Thomas L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:17
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/14; E21D11/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A TUNNEL LINER COMPRISING A PLURALITY OF GENERALLY RECTANGULAR SKIN PLATES CURVED LONGITUDINALLY, EACH HAVING INWARDLY EXTENDING SIDE FLANGES AND ENDS FLANGES, AN INWARDLY EXTENDING GROOVE ON THE OUTER SURFACE OF EACH SIDE FLANGE AND END FLANGE, SAID FLANGES BEING FASTENED TOGETHER TO FORM WITH THE CURVED SKIN PLATES A CYLINDRICAL LINER, SAID GROOVES OF ADJACENT PLATES MATING TO FORM A CONTINUOUS PASSAGE BETWEEN THE LINER PLATES, AN OPENING IN AT LEAST ONE SIDE AND END FLANGE OF EACH PLATE COMMUNICATING THROUGH SAID FLANGE TO SAID PASSAGE, CHECK VALVE MEANS COMMUNICATING WITH SAID PASSAGE AND A RESILIENT RUBBER-LIKE MASS FILLING SAID PASSAGE UNDER PRESSURE AND HAVING BEEN PUMPED THEREIN THROUGH SAID CHECK VALVE.
Claim 2
Dependent Claim
113 words
A TUNNEL LINER COMPRISING A PLURALITY OF GENERALLY RECTANGULAR SKIN PLATES CURVED LONGITUDINALLY, EACH HAVING INWARDLY EXTENDING SIDE FLANGES AND ENDS FLANGES, AN INWARDLY EXTENDING GROOVE ON THE OUTER SURFACE OF EACH SIDE FLANGE AND END FLANGE, SAID FLANGES BEING FASTENED TOGETHER TO FORM WITH THE CURVED SKIN PLATES A CYLINDRICAL LINER, SAID GROOVES OF ADJACENT PLATES MATING TO FORM A CONTINUOUS PASSAGE BETWEEN THE LINER PLATES, AN OPENING IN AT LEAST ONE SIDE AND END FLANGE OF EACH PLATE COMMUNICATING THROUGH SAID FLANGE TO SAID PASSAGE, CHECK VALVE MEANS COMMUNICATING WITH SAID PASSAGE AND A RESILIENT RUBBER-LIKE MASS FILLING SAID PASSAGE UNDER PRESSURE AND HAVING BEEN PUMPED THEREIN THROUGH SAID CHECK VALVE.
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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |