Patent US415685A successfully refreshed from Google Patents.
US3508317A
Expired / Lapsed
US
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Apparatus for lining a tunnel
Assignee: Ingersoll Rand Co
•
Filing: 1967-05-04
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Granted: 1970-04-28
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Expires: 1987-05-04
Abstract
No abstract record available.
Inventors
- 👤 George A Hill
- 👤 John T Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:12
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/40; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5122; Y10T29/53; Y10T29/53526
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2331504A
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US2600630A
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US2631015A
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US2862469A
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US2996085A
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US3092056A
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US3217402A
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US3309003A
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US3401442A
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US3393546A
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US3380147A
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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) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |