Patent US4261339A successfully refreshed from Google Patents.
US3549985A
Expired / Lapsed
US
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Metal detecting device having a diskshaped head for housing a coil system
Assignee: ELECTRONIC SENSING PRODUCTS Inc
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Filing: 1969-02-27
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Granted: 1970-12-22
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Expires: 1989-02-27
Abstract
No abstract record available.
Inventors
- 👤 Robert S Penland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:57
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2451596A
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US2680226A
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US3001105A
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US3153694A
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US3336552A
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US3210701A
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US3210457A
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US3377522A
Cited
US3290635A
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US3467855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |