US4208604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure mercury vapor discharge lamp
Assignee: US Philips Corp
•
Filing: 1978-08-18
•
Granted: 1980-06-17
•
Expires: 1998-08-18
Abstract
Abstract Low-pressure mercury vapor discharge lamp comprising an U-shaped discharge tube of which at least the legs are accommodated in recesses of a cylindrical body.
Inventors
- 👤 Winston D. Couwenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:10
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A low-pressure mercury vapor discharge lamp which comprises: at least one U-shaped discharge tube, and a generally cylindrical body having recesses, each discharge tube having first and second legs, each of said legs of said discharge tube being disposed at least partly in said recesses, said legs extending along the circumference of said body over an angle of at least 150°, said generally cylindrical body being transmissive to light, each of said U-shaped discharge tubes being disposed in substantially coplanar relationship with the axis of said generally cylindrical body.
Claim 2
Dependent Claim
89 words
A low-pressure mercury vapor discharge lamp which comprises: at least one U-shaped discharge tube, and a generally cylindrical body having recesses, each discharge tube having first and second legs, each of said legs of said discharge tube being disposed at least partly in said recesses, said legs extending along the circumference of said body over an angle of at least 150°, said generally cylindrical body being transmissive to light, each of said U-shaped discharge tubes being disposed in substantially coplanar relationship with the axis of said generally cylindrical body.
Claim 3
Dependent Claim
23 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 wherein said generally cylindrical body consists of a transparent synthetic resin material.
Claim 4
Dependent Claim
20 words
A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 2 wherein said generally cylindrical body is hollow.
Claim 5
Dependent Claim
91 words
A low-pressure mercury vapor discharge lamp which comprises: at least one U-shaped discharge tube, and a generally cylindrical body having recesses, each discharge tube having first and second legs, each of said legs of sad discharge tube being disposed at least partly in said recesses, said legs extending along the circumference of said body over an angle of at least 150°, said generally cylindrical body consisting of a synthetic resin material and being hollow, the wall of said recesses in said body facing said discharge tube including a reflective coating thereon.
Claim 6
Dependent Claim
91 words
A low-pressure mercury vapor discharge lamp which comprises: at least one U-shaped discharge tube, and a generally cylindrical body having recesses, each discharge tube having first and second legs, each of said legs of sad discharge tube being disposed at least partly in said recesses, said legs extending along the circumference of said body over an angle of at least 150°, said generally cylindrical body consisting of a synthetic resin material and being hollow, the wall of said recesses in said body facing said discharge tube including a reflective coating thereon.
References Cited (Backward Citations)
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Cited
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Cited
US1857120A
Cited
US1870147A
Cited
US3775609A
Cited
US3953761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |