US3375376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-intruder device using vibration responsive member between light and photocell
Assignee: United States Department of the Navy
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Filing: 1964-02-20
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Granted: 1968-03-26
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Expires: 1984-02-20
Abstract
No abstract record available.
Inventors
- 👤 David W Kermode
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:18
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/26; G08B13/16; G08B13/1654; G08B13/18; G08B13/181; G08B13/183
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
136 words
IN A METHOD DETECTION SYSTEM, MEANS INCLUDING: A UNIJUNCTION TRANSISTOR OSCILLATOR CIRCUIT FOR SUPPLYING AN OSCILLATING ELECTRICAL LIGHT SOURCE FOR PRODUCING A CONTINUOUS LIGHT EMITTING LIGHT SOURCE FOR PRODUCING A BEAM OF LIGHT; A LIGHT RESPONSIVE DEVICE INCLUDING AN ELECTRICAL CURRENT CONDUCTING VARIABLE RESISTANCE MEANS DISPOSED WITHIN THE PATH OF SAID BEAM SO THAT THE LIGHT BEAM MAY BE CAUSED TO IMPINGE THEREON; MEANS ADAPTED TO VARY THE QUANTITY OF LIGHT OF SAID BEAM IMPINGING ON SAID DEVICE IN RESPONSE TO EXTERNALLY INDUCED SYSTEM VIRBATIONS; AND AN ELECTRICAL CIRCUIT INCLUDING A VOLTAGE DIVIDER NETWORK AND CAPACITANCE COUPLING MEANS CONNECTING SAID LIGHT RESPONSIVE DEVICE WITH THE OSCILLATOR CIRCUIT AT THE EMITTER ELECTRODE AND ONE BASE ELECTRODE OF THE UNIJUNCTION TRANSISTOR FOR VARYING BOTH AMPLITUDE AND FREQUENCY OF THE OSCILLATOR OUTPUT SIGNAL IN RESPONSE TO INDUCED SYSTEM VIBRATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |