US3900753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure sodium vapor lamp having low starting voltage
Assignee: GTE Sylvania Inc
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Filing: 1974-05-23
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Granted: 1975-08-19
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Expires: 1994-05-23
Abstract
Abstract The alumina arc tube of a high pressure sodium arc discharge lamp contains a Penning mixture gaseous filling and also has an encircling wire ring starting aid, in order to reduce lamp starting voltage. A temperature actuated circuit breaking device is in series with the starting aid in order to electrically remove it from the circuit after the lamp starts.
Inventors
- 👤 Donald A Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:20
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/54; H01J61/541; H01J61/544
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A HIGH PRESSURE SODIUM ARC DISCHARGE LAMP COMPRISING AN ALUMINA ARC TUBE DISPOSED WITHIN AN OUTER JACKET, THE ARC TUBE HAVING AN ELECTRODE AT EACH END AND CONTAINING A FILL INCLUDING SODIUM, AN MERCURY AND A PENNING GAS MIXTURE, A WIRE RING STARTING AID ENCIRCLING THE ARC TUBE, MORE PROXIMATE ONE ELECTRODE THAN THE OTHER, AND ELECTRICALLY CONNECTED TO SAID OTHER ELECTRODE THROUGH A TEMPERATURE ACTUATED SWITCH WHICH IS NORMALLY CLOSED AT ROOM TEMPERATURE AND WHICH IS OPEN DURING NORMAL LAMP OPERATION, THEREBY ELECTRICALLY DISCONNECTING THE WIRE RING STARTING AID.
Claim 2
Dependent Claim
90 words
A HIGH PRESSURE SODIUM ARC DISCHARGE LAMP COMPRISING AN ALUMINA ARC TUBE DISPOSED WITHIN AN OUTER JACKET, THE ARC TUBE HAVING AN ELECTRODE AT EACH END AND CONTAINING A FILL INCLUDING SODIUM, AN MERCURY AND A PENNING GAS MIXTURE, A WIRE RING STARTING AID ENCIRCLING THE ARC TUBE, MORE PROXIMATE ONE ELECTRODE THAN THE OTHER, AND ELECTRICALLY CONNECTED TO SAID OTHER ELECTRODE THROUGH A TEMPERATURE ACTUATED SWITCH WHICH IS NORMALLY CLOSED AT ROOM TEMPERATURE AND WHICH IS OPEN DURING NORMAL LAMP OPERATION, THEREBY ELECTRICALLY DISCONNECTING THE WIRE RING STARTING AID.
Claim 3
Dependent Claim
13 words
The lamp of claim 1 wherein the gas mixture comprises neon and argon.
Claim 4
Dependent Claim
14 words
The lamp of claim 2 wherein the gas mixture comprises at least 99% neon.
Claim 5
Dependent Claim
41 words
The lamp of claim 1 wherein said arc tube has an arc length of 69 mm, said Penning gas mixture is 99% neon and 1% argon and said wire ring starting aid is 24.1 mm from said more proximate one electrode.
Claim 6
Dependent Claim
41 words
The lamp of claim 1 wherein said arc tube has an arc length of 69 mm, said Penning gas mixture is 99.7% neon and 0.3% argon and said wire ring starting aid is 16.2 mm from said more proximate one electrode.
References Cited (Backward Citations)
US3721846A
Cited
US3721845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |