US3564529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic field rate detector
Assignee: United States Department of the Navy
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Filing: 1965-10-21
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Granted: 1971-02-16
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Expires: 1985-10-21
Abstract
Abstract A SYSTEM AND METHOD FOR ELECTROSTATICALLY DETECTING THE DISTANCE OF ONE OBJECT FROM ANOTHER UTILIZING A CONDUCTOR PLACED IN THE ELECTROSTATIC FIELD OF THE MOVING OBJECT SO THAT A REARRANGEMENT OF CHARGE ON THE CONDUCTOR''S SURFACE OCCURS AND THIS SHIFTING OF CHARGE IS DIRECTED THROUGH AN IMPEDANCE SO THAT A VOLTAGE IS DEVELOPED WHICH IS A MEASURE OF THE FIELD STRENGTH CAUSING THE CHANGE IN CHARGE OF THE CONDUCTOR. AN INPUT CIRCUIT, A DIFFERENTIATOR, AN AMPLIFIER, A RECORDER, AND A SPHERE, AS THE CONDUCTING OR DETECTING ELEMENT, COMPRISE THE BASIC APPARATUS OF THIS INVENTION.
Inventors
- 👤 Maxime G Kaufman
- 👤 Joseph P Dougherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:36
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/28
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |