US3370284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical space alarm
Assignee: Individual
•
Filing: 1965-01-21
•
Granted: 1968-02-20
•
Expires: 1985-01-21
Abstract
No abstract record available.
Inventors
- 👤 Samuel M Bagno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:10
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/181; G08B13/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A SYSTEM FOR DETECTING A MOVING INTRUDER IN A PROTECTED SPACE WITH THE AID OF ILLUMINATION AND PHOTOSENSORS, COMPRISING MEANS TO ILLUMINATE THE SPACE, MEANS TO MODULATE THE ILLUMINATION AT A CHARACTERISTIC FREQUENCY DIFFERENT FROM THAT OF ORDINARY AC, MEANS TO DIVIDE THE PROTECTED SPACE INTO ZONES WHICH ARE SUCCESSIVELY OF OPPOSITE ELECTRICAL PHASE, A TUNED AMPLIFIER ACTING AS A SELECTOR MEANS TO SELECT THE OUTPUT OF A PHOTOSENSOR TO THE AFORESAID CHARACTERISTIC MODULATION FREQUENCY AND THEREBY REJECTING THE EFFECT OF OTHERS ILLLUMINATING, SAID OUTPUT FROM THE SELECTOR MEANS BEING MODULATED IN RESPONSE TO MOTION OF AN INTRUDER FROM ONE ZONE TO A NEXT ZONE, AND A PHASE AMPLITUDE DETECTOR TO DEMODULATE THE SAID SELECTOR OUTPUT AND SAID DETECTOR BEING A BALANCED DETECTOR PROVIDING A PUSH PULL OUTPUT, A VERY LOW FREQUENCY LOW PASS FILTERED AMPLIFIER, CAPACITORS FOR CAPACITY COUPLING THE SAID DETECTOR TO THE SAID LOW PASS FILTERED AMPLIFIER, A FULL WAVE RECTIFIER FOR RECTIFYING THE OUTPUT OF THE LOW PASS FILTERED AMPLIFIER IN ORDER TO PROVIDE A DC OUTPUT IN RESPONSE TO MOTION OF A INTRUDER, AND AN ALARM CIRCUITRY RESPONSE TO SAID DC OUTPUT.
Claim 2
Independent Claim
187 words
A SYSTEM FOR DETECTING A MOVING INTRUDER IN A PROTECTED SPACE WITH THE AID OF ILLUMINATION AND PHOTOSENSORS, COMPRISING MEANS TO ILLUMINATE THE SPACE, MEANS TO MODULATE THE ILLUMINATION AT A CHARACTERISTIC FREQUENCY DIFFERENT FROM THAT OF ORDINARY AC, MEANS TO DIVIDE THE PROTECTED SPACE INTO ZONES WHICH ARE SUCCESSIVELY OF OPPOSITE ELECTRICAL PHASE, A TUNED AMPLIFIER ACTING AS A SELECTOR MEANS TO SELECT THE OUTPUT OF A PHOTOSENSOR TO THE AFORESAID CHARACTERISTIC MODULATION FREQUENCY AND THEREBY REJECTING THE EFFECT OF OTHERS ILLLUMINATING, SAID OUTPUT FROM THE SELECTOR MEANS BEING MODULATED IN RESPONSE TO MOTION OF AN INTRUDER FROM ONE ZONE TO A NEXT ZONE, AND A PHASE AMPLITUDE DETECTOR TO DEMODULATE THE SAID SELECTOR OUTPUT AND SAID DETECTOR BEING A BALANCED DETECTOR PROVIDING A PUSH PULL OUTPUT, A VERY LOW FREQUENCY LOW PASS FILTERED AMPLIFIER, CAPACITORS FOR CAPACITY COUPLING THE SAID DETECTOR TO THE SAID LOW PASS FILTERED AMPLIFIER, A FULL WAVE RECTIFIER FOR RECTIFYING THE OUTPUT OF THE LOW PASS FILTERED AMPLIFIER IN ORDER TO PROVIDE A DC OUTPUT IN RESPONSE TO MOTION OF A INTRUDER, AND AN ALARM CIRCUITRY RESPONSE TO SAID DC OUTPUT.
References Cited (Backward Citations)
DE396846C
Cited
US1877279A
Cited
US2016036A
Cited
US2269340A
Cited
US2631273A
Cited
US2912683A
Cited
US3036219A
Cited
US3191048A
Cited
US3278923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |