US3438142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sea mining method and apparatus
Assignee: Individual
•
Filing: 1965-06-07
•
Granted: 1969-04-15
•
Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 Manfred G Krutein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:38
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/8833; E02F3/8841; E02F7/00; E02F7/04; E02F9/00; E02F9/06; E21; E21C; E21C50/00
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |