US3379264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring machine
Assignee: Dravo Corp
•
Filing: 1964-11-05
•
Granted: 1968-04-23
•
Expires: 1984-11-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:42
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/03; E21D1/06; E21D9/00; E21D9/10; E21D9/11; E21D9/112
Claims Analysis
Total Claims: 0
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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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |