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Patent US3446535A successfully refreshed from Google Patents.
US3446535A
Expired / Lapsed
US
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Tunnel driving machine
Assignee: HABEGGER AG MASCHF
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Filing: 1967-03-06
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Granted: 1969-05-27
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Expires: 1987-03-06
Abstract
No abstract record available.
Inventors
- 👤 Ernst Lauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:05
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/1093; E21D9/11; E21D9/116; E21D9/117
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US14483A
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US2211751A
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US2752143A
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US2760766A
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US3295892A
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US3290095A
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US3355215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |