US3004753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel boring machine having oppositely rotating tool holders on a rotating carrier
Assignee: Individual
•
Filing: 1958-01-22
•
Granted: 1961-10-17
•
Expires: 1978-01-22
Abstract
No abstract record available.
Inventors
- 👤 Sik Sigmund Leopold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:30
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/1086; E21D9/1006; E21D9/1013; E21D9/1033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |