US3494136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grout seal for tail shield of tunneling machine
Assignee: Smith International Inc
•
Filing: 1968-06-28
•
Granted: 1970-02-10
•
Expires: 1988-06-28
Abstract
No abstract record available.
Inventors
- 👤 Carl A Wilms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:32
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/06; E21D9/0635; E21D11/00; E21D11/04; E21D11/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US311656A
Cited
US549586A
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US993507A
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US1484188A
Cited
US1989110A
Cited
US2348587A
Cited
US3410098A
Cited
US3379445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |