Patent US4117370A successfully refreshed from Google Patents.
US4117370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge lamp having a glow discharge starter within the outer envelope
Assignee: US Philips Corp
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Filing: 1977-03-16
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Granted: 1978-09-26
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Expires: 1997-03-16
Abstract
Abstract A high-pressure sodium vapor discharge lamp which is provided with a discharge tube and an outer envelope which envelopes this tube. In accordance with the improvement there are disposed in the space between the discharge tube and the outer envelope both a capacitor and a glow discharge starter which are both in parallel with the discharge tube. Consequently an external lamp starter is superfluous. In addition the lamp base may be relatively small.
Inventors
- 👤 Cornelis Adrianus Joannes Jacobs
- 👤 Antonius Jozephus Gerardus Cornelis Driessen
- 👤 Gerardus Antonius Petrus Maria Cornelissen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:04
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/54; H01J61/541; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
A discharge lamp which comprises: a main discharge tube, an outer envelope enveloping said discharge tube, a circuit for starting a discharge in said discharge tube which includes a capacitor belonging to said circuit disposed between said discharge tube and said outer envelope and a glow discharge starter which includes a bimetal strip, said glow discharge starter being disposed between said main discharge tube and said outer envelope, said glow discharge starter being connected electrically in parallel with both said main discharge and said capacitor.
Claim 2
Dependent Claim
85 words
A discharge lamp which comprises: a main discharge tube, an outer envelope enveloping said discharge tube, a circuit for starting a discharge in said discharge tube which includes a capacitor belonging to said circuit disposed between said discharge tube and said outer envelope and a glow discharge starter which includes a bimetal strip, said glow discharge starter being disposed between said main discharge tube and said outer envelope, said glow discharge starter being connected electrically in parallel with both said main discharge and said capacitor.
Claim 3
Dependent Claim
50 words
A discharge lamp as claimed in claim 1 wherein said lamp is a high-pressure discharge lamp and wherein said glow discharge starter constitutes a shield against direct heat rays which are directed toward said capacitor and which emerge from said main discharge tube in the operating condition of said lamp.
References Cited (Backward Citations)
US2369767A
Cited
US3982154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |