Patent US3528004A successfully refreshed from Google Patents.
US3528004A
Expired / Lapsed
US
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Apparatus for detecting the proximity of a metal body
Assignee: Individual
•
Filing: 1967-09-25
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Granted: 1970-09-08
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Expires: 1987-09-25
Abstract
No abstract record available.
Inventors
- 👤 Hayao Katabami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:58
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/101; H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/952; H03K17/9537; H03K17/9542; H03K17/9545
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA662393A
Cited
US2376659A
Cited
US2321355A
Cited
US2321356A
Cited
US2779904A
Cited
US3046479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |