US3159755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency lighting unit
Assignee: Maintenance Co Inc
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Filing: 1962-09-10
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Granted: 1964-12-01
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Expires: 1982-09-10
Abstract
No abstract record available.
Inventors
- 👤 Edward T Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:18
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/02; H05; H05B; H05B47/00; H05B47/10; H05B47/105; H05B47/11; Y; Y02; Y02B; Y02B20/00; Y02B20/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
AN EMERGENCY LIGHTING UNIT WHICH COMPRISES: TRANSFORMER MEANS HAVING A PRIMARY WINDING CONNECTABLE TO AN ALTERNATING CURRENT POWER SOURCE AND A SECONDARY WINDING INCLUDING FIRST AND SECOND TERMINALS AND A TAP THEREBETWEEN; RECHARGEABLE BATTERY MEANS HAVING A FIRST POLE ELECTRICALLY CONNECTED TO SAID FIRST TERMINAL AND A SECOND POLE; VOLTAGE DIVIDER MEANS ELECTRICALLY CONNECTED BETWEEN SAID FIRST AND SECOND POLES, COMPRISING A FIXED RESISTOR IN ELECTRICAL SERIES RELATIONSHIP WITH A LIGHT SENSITIVE RESISTOR EXPOSED TO AMBIENT LIGHT AND HAVING A VOLTAGE DIVIDER TAP THEREBETWEEN; SOLID STATE SWITCHING MEANS HAVING AT LEAST AN ANODE, A CATHODE, AND A GATE, SAID GATE BEING ADAPTED TO BE ENERGIZED FROM SAID VOLTAGE DIVIDER TAP AND SAID CATHODE BEING ELECTRICALLY CONNECTED TO SAID SECOND POLE; LIGHT PRODUCING MEANS ELECTRICALLY CONNECTED
Claim 2
Dependent Claim
125 words
AN EMERGENCY LIGHTING UNIT WHICH COMPRISES: TRANSFORMER MEANS HAVING A PRIMARY WINDING CONNECTABLE TO AN ALTERNATING CURRENT POWER SOURCE AND A SECONDARY WINDING INCLUDING FIRST AND SECOND TERMINALS AND A TAP THEREBETWEEN; RECHARGEABLE BATTERY MEANS HAVING A FIRST POLE ELECTRICALLY CONNECTED TO SAID FIRST TERMINAL AND A SECOND POLE; VOLTAGE DIVIDER MEANS ELECTRICALLY CONNECTED BETWEEN SAID FIRST AND SECOND POLES, COMPRISING A FIXED RESISTOR IN ELECTRICAL SERIES RELATIONSHIP WITH A LIGHT SENSITIVE RESISTOR EXPOSED TO AMBIENT LIGHT AND HAVING A VOLTAGE DIVIDER TAP THEREBETWEEN; SOLID STATE SWITCHING MEANS HAVING AT LEAST AN ANODE, A CATHODE, AND A GATE, SAID GATE BEING ADAPTED TO BE ENERGIZED FROM SAID VOLTAGE DIVIDER TAP AND SAID CATHODE BEING ELECTRICALLY CONNECTED TO SAID SECOND POLE; LIGHT PRODUCING MEANS ELECTRICALLY CONNECTED
References Cited (Backward Citations)
US2995695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |