Patent US3555533A successfully refreshed from Google Patents.
US3555533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail-safe proximity measuring system
Assignee: Individual
•
Filing: 1967-05-16
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Granted: 1971-01-12
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Expires: 1987-05-16
Abstract
Abstract THE FOLLOWING DISCLOSURE DESCRIBES A PROXIMITY SENSING SYSTEM EMPLOYING A CAPACTIVE PROBE UNIT CONNECTED IN A BRIDGE FEEDBACK CIRCUIT OF AN AMPLIFIER, SO THAT UNBALANCES OF THE BRIDGE CIRCUIT CONTROL THE OSCILLATORY CONDITION OF THE AMPLIFIER. THE PROBE UNIT INCLUDES ELECTRONIC CIRCUITS, AND IS CONNECTED BY CABLES TO A REMOTE INDICATING, ADJUSTING AND POWER SUPPLY UNIT.
Inventors
- 👤 Abraham Edelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:35
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955; G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01F23/265; H03K2217/00; H03K2217/94; H03K2217/96; H03K2217/9607; H03K2217/960735; H03K2217/96075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |