Patent US3498675A successfully refreshed from Google Patents.
US3498675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel driving machine having symmetrical braces
Assignee: Mannesmann Demag AG
•
Filing: 1968-03-19
•
Granted: 1970-03-03
•
Expires: 1988-03-19
Abstract
No abstract record available.
Inventors
- 👤 Gerd Kampf-Emden
- 👤 Wilhelm Staymann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:18
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22; E21D; E21D9/00; E21D9/10; E21D9/1006; E21D9/1013; E21D9/102; E21D9/1093; E21D9/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |