Patent US2870427A successfully refreshed from Google Patents.
US2870427A
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Device for detecting and indicating proximity of objects
Assignee: W K KELLOGG FOUNDATION
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Filing: 1952-03-11
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Granted: 1959-01-20
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Expires: 1972-03-11
Abstract
No abstract record available.
Inventors
- 👤 Wallace E Frank
- 👤 Frederick F Ohntrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:20
CPC Classifications
A; A61; A61H; A61H3/00; A61H3/06; A61H3/068; A61H3/061; G; G01; G01V; G01V3/00; G01V3/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2112826A
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US2333119A
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US2421771A
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US2422542A
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US2490238A
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US2496639A
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US2646559A
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US2605393A
Cited
US2791762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |