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US3706901A
Expired / Lapsed
US
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Discharge lamp provided with a substantially straight oblong discharge tube
Assignee: US Philips Corp
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Filing: 1971-03-01
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Granted: 1972-12-19
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Expires: 1991-03-01
Abstract
Abstract The invention relates to a discharge lamp provided with a substantially straight oblong discharge tube and an outer envelope surrounding this tube. The invention provides a solution in which a simple positioning of the discharge tube in the outer envelope can be obtained with the aid of an elongated part of the terminal wire. This solution is combined with an anti-shadow winding of that part of the terminal wire, which extends along the straight part of the discharge tube. By using this anti-shadow winding there need not be the risk of cracks in the outer envelope as a result of expansion of the terminal wire (by heat produced in the discharge tube).
Inventors
- 👤 Gerard Marie Jules De Neve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:38
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A discharge lamp provided with a substantially straight, oblong discharge tube and an outer envelope surrounding said tube in which a convolute part of a terminal wire constitutes a centring member of the discharge tube, wherein substantially the entire convolute part of the terminal wire near the end part of the outer envelope bears against the inner side of said end part, the part of the terminal wire extending along the straight part of the discharge tube being bent in such a manner that its center of gravity is located alongside the terminal wire and in which the center line of the last mentioned part of the terminal wire can only have tangents which constitute an angle of greater than 0* but less than 25* with the longitudinal axis of the lamp.
Claim 2
Dependent Claim
132 words
A discharge lamp provided with a substantially straight, oblong discharge tube and an outer envelope surrounding said tube in which a convolute part of a terminal wire constitutes a centring member of the discharge tube, wherein substantially the entire convolute part of the terminal wire near the end part of the outer envelope bears against the inner side of said end part, the part of the terminal wire extending along the straight part of the discharge tube being bent in such a manner that its center of gravity is located alongside the terminal wire and in which the center line of the last mentioned part of the terminal wire can only have tangents which constitute an angle of greater than 0* but less than 25* with the longitudinal axis of the lamp.
Claim 3
Dependent Claim
60 words
A discharge lamp as claimed in claim 1, in which the end part of the outer envelope substantially has the shape of a concave hemisphere, wherein the center line of the convolute part of the terminal wire located near the end part of the outer envelope is substantially located in a flat plane containing the longitudinal axis of the lamp.
Claim 4
Dependent Claim
43 words
A discharge lamp as claimed in claim 1 characterized in that the part of the terminal wire extending along the straight part of the discharge tube is helically bent at a pitch which is approximately three times the length of the discharge tube.
References Cited (Backward Citations)
GB440138A
Cited
US2173261A
Cited
US2425865A
Cited
US3300675A
Cited
US3425864A
Cited
FR1557527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |