US3406342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety monitoring and acknowledgment system for subterranean structures using radio relays
Assignee: Individual
•
Filing: 1966-01-19
•
Granted: 1968-10-15
•
Expires: 1986-01-19
Abstract
No abstract record available.
Inventors
- 👤 Hubner Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:51
CPC Classifications
G; G08; G08C; G08C17/00; E; E21; E21F; E21F17/00; G08C25/00; G08C25/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1470430A
Cited
US2219653A
Cited
US2408878A
Cited
US3221320A
Cited
US3104356A
Cited
US3155909A
Cited
US3278850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |