Patent US4425601A successfully refreshed from Google Patents.
US4425601A
Expired / Lapsed
US
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Stairway lighting system
Assignee: Individual
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Filing: 1981-08-31
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Granted: 1984-01-10
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Expires: 2001-08-31
Abstract
Abstract An improved apparatus for illuminating a plurality of stairs when in use involves a transformer to provide a reduced A. C. voltage; at least one light in proximity to the stairs to illuminate the stairs when at least a portion of the reduced A. C. voltage is supplied to the light and an electrical circuit including the light is formed; a rectifier to convert the reduced A. C. voltage to a D. C. voltage; a plurality of pressure sensitive switches associated with the rectifier and the treads of the stairs; physical pressure on the tread or treads acting to close at least one of the switches; and a relay in association with the pressure sensitive switches and light, and adapted to form the electrical circuit including the light in response to the closing of at least one of the pressure sensitive switches.
Inventors
- 👤 Robert Donahue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:29
CPC Classifications
F; F21; F21V; F21V23/00; F21V23/04; F21V23/0442; F21V23/0485; F21V33/00; F21V33/006; H; H05; H05B; H05B47/00; H05B47/10; H05B47/105; H05B47/115; E; E04; E04F; E04F11/00; E04F11/02; E04F11/104; E04F2011/1046; E04F2011/1048; F21W; F21W2111/00; F21W2111/02; F21W2111/027; Y; Y02; Y02B; Y02B20/00; Y02B20/40; Y10; Y10S; Y10S362/00; Y10S362/802
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
242 words
An apparatus powered by an A.C. line voltage source which comprises a plurality of stairs each of which includes a tread and a riser, said plurality of stairs being useable by one or more persons; transformer means adapted to reduce said A.C. line voltage from said source to provide a reduced A.C. voltage; a plurality of light means acting to illuminate said stairs when at least a portion of said reduced A.C. voltage is supplied to said plurality of light means and an electrical circuit including said plurality of light means is formed, each said light means being located in association with a different one of said risers; rectifier means associated with said transformer means acting to convert said reduced A.C. voltage to a D.C. voltage; a plurality of pressure sensitive switch means associated with said rectifier means so that at least a portion of said D.C. voltage is supplied to said plurality of pressure sensitive switch means, each of said switch means being located in association with a different one of said treads so that said pressure sensitive switch means is closeable in response to pressure from said person placed on said tread; with which said pressure sensitive switch means is associated; and relay means in association with said plurality of pressure sensitive means and said plurality of light means, and adapted to form said electrical circuit in response to at least one of said pressure sensitive switch means being closed.
Claim 2
Independent Claim
242 words
An apparatus powered by an A.C. line voltage source which comprises a plurality of stairs each of which includes a tread and a riser, said plurality of stairs being useable by one or more persons; transformer means adapted to reduce said A.C. line voltage from said source to provide a reduced A.C. voltage; a plurality of light means acting to illuminate said stairs when at least a portion of said reduced A.C. voltage is supplied to said plurality of light means and an electrical circuit including said plurality of light means is formed, each said light means being located in association with a different one of said risers; rectifier means associated with said transformer means acting to convert said reduced A.C. voltage to a D.C. voltage; a plurality of pressure sensitive switch means associated with said rectifier means so that at least a portion of said D.C. voltage is supplied to said plurality of pressure sensitive switch means, each of said switch means being located in association with a different one of said treads so that said pressure sensitive switch means is closeable in response to pressure from said person placed on said tread; with which said pressure sensitive switch means is associated; and relay means in association with said plurality of pressure sensitive means and said plurality of light means, and adapted to form said electrical circuit in response to at least one of said pressure sensitive switch means being closed.
Claim 3
Dependent Claim
49 words
The apparatus of claim 1 which further comprises manual switch means associated with said light means and capable of being manually closed to form said electrical circuit and cause said plurality of light means to illuminate said stairs irrespective of any of said pressure sensitive switch means being closed.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein said rectifier means includes a diode and a capacitor in series.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 wherein said relay means includes relay contacts, a relay coil and a relay capacitor connected in parallel with said relay coil.
Claim 6
Dependent Claim
19 words
The apparatus of claim 1 which includes a plurality of said light means connected in parallel to each other.
Claim 7
Dependent Claim
24 words
The apparatus of claim 1 wherein said reduced A.C. voltage is in the range of about 3 volts A.C. to about 30 volts A.C.
Claim 8
Dependent Claim
24 words
The apparatus of claim 1 wherein said reduced A.C. voltage is in the range of about 6 volts A.C. to about 18 volts A.C.
Claim 9
Dependent Claim
15 words
The apparatus of claim 1 wherein said reduced A.C. voltage is about 12 volts A.C.
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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |