US3471773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal detecting device with inductively coupled coaxial transmitter and receiver coils
Assignee: ELECTRONIC SENSING PRODUCTS Inc
•
Filing: 1967-12-20
•
Granted: 1969-10-07
•
Expires: 1987-12-20
Abstract
No abstract record available.
Inventors
- 👤 Robert S Penland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:42
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2066561A
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US2066135A
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US2129058A
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US2160356A
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US2201256A
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US2451596A
Cited
US3020470A
Cited
US2681434A
Cited
US3309690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |