US3699382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary lighting system for arc lamp
Assignee: GTE Sylvania Inc
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Filing: 1971-02-04
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Granted: 1972-10-17
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Expires: 1991-02-04
Abstract
Abstract An auxiliary lighting system for a high pressure arc discharge lamp operated by a ballast having AC input terminals and output terminals for connecting the arc lamp in an operating circuit loop. A current sensing electromagnetic relay controls a standby incandescent lamp to provide illumination during the arc lamp cooling off period following a power interruption. The relay coil is series connected in the arc lamp circuit loop, and the relay contacts are serially connected with the incandescent lamp across the AC input of the ballast. A preferred embodiment further includes a current sensitive thermal relay for controlling the standby incandescent lamp to maintain a light output during the warm up period following restriking of the arc lamp.
Inventors
- 👤 Anton Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:46
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
An auxiliary lighting system for an arc lamp operated by a ballast having an AC voltage input means and output means for connecting said arc lamp in a lamp operating circuit loop, said auxiliary lighting system comprising, in combination, a current sensing heating element series connected in said arc lamp circuit loop, and an incandescent lamp and switching means serially connected across the AC voltage input means of said ballast, said heating element and switching means comprising a thermal relay, and said switching means being the set of contacts of said relay controlled by said heating element.
Claim 2
Dependent Claim
97 words
An auxiliary lighting system for an arc lamp operated by a ballast having an AC voltage input means and output means for connecting said arc lamp in a lamp operating circuit loop, said auxiliary lighting system comprising, in combination, a current sensing heating element series connected in said arc lamp circuit loop, and an incandescent lamp and switching means serially connected across the AC voltage input means of said ballast, said heating element and switching means comprising a thermal relay, and said switching means being the set of contacts of said relay controlled by said heating element.
Claim 3
Dependent Claim
44 words
A lighting system according to claim 1 further including an electromagnetic relay having a current sensing coil series connected with the heating element of said thermal relay in said arc lamp circuit loop and a set of contacts connected across the thermal relay contacts.
Claim 4
Dependent Claim
88 words
A lighting system according to claim 2 wherein the contacts of said thermal and electromagnetic relays are normally closed, said electromagnetic relay contacts are opened and closed in response to commencement and cessation, respectively, of current flow in said arc lamp circuit loop, and the heating element of said thermal relay is selected to delay the opening of said thermal relay contacts for a predetermined period after commencement of current flow in said arc lamp circuit loop, said predetermined period approximating the warm-up period of said arc lamp.
Claim 5
Dependent Claim
121 words
An auxiliary lighting system for an arc lamp operated by a ballast having AC voltage input means and output means for connecting said arc lamp in a lamp operating circuit loop, said auxiliary lighting system comprising in combination: a current sensing coil series connected in said arc lamp circuit loop; an incandescent lamp and switching means serially connected across the AC voltage input means of said ballast; said coil and switching means comprising an electromagnetic relay with said switching means being the set of contacts of said electromagnetic relay controlled by said coil; and a thermal relay having a heating element series connected with said coil in said arc lamp circuit loop and a set of contacts connected across said coil.
Claim 6
Dependent Claim
121 words
An auxiliary lighting system for an arc lamp operated by a ballast having AC voltage input means and output means for connecting said arc lamp in a lamp operating circuit loop, said auxiliary lighting system comprising in combination: a current sensing coil series connected in said arc lamp circuit loop; an incandescent lamp and switching means serially connected across the AC voltage input means of said ballast; said coil and switching means comprising an electromagnetic relay with said switching means being the set of contacts of said electromagnetic relay controlled by said coil; and a thermal relay having a heating element series connected with said coil in said arc lamp circuit loop and a set of contacts connected across said coil.
Claim 7
Dependent Claim
104 words
A lighting system according to claim 4 wherein the contacts of said thermal and electromagnetic relays are normally closed, the heating element of said thermal relay is selected to delay the opening of said thermal relay contacts for a predetermined period after commencement of current flow in said arc lamp circuit loop, said predetermined period approximating the warm-up period of said arc lamp, said electromagnetic relay contacts are opened upon energization of said relay coil after the opening of said thermal relay contacts, and said electromagnetic relay contacts are closed in response to the cessation of current flow in said arc lamp circuit loop.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |