Patent US3665235A successfully refreshed from Google Patents.
US3665235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercury vapor lamp
Assignee: Compagnie Electro Mecanique SA
•
Filing: 1970-04-21
•
Granted: 1972-05-23
•
Expires: 1990-04-21
Abstract
Abstract In a doped mercury vapor lamp having an elongate vertical burner, an upper portion of the surface of the burner is maintained at a lower temperature than a lower portion to reduce separation of the dopant. Heat-emission from the upper portion of the surface of the burner may be increased compared to the lower portion of the burner by increasing the diameter (and hence the heat-exchange area per unit length) in the upper portion, by reducing the thickness of an air gap to an envelope in the upper portion, or by playing coolant selectively on to the upper portion of the surface of the burner.
Inventors
- 👤 Andre Albert Hugot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:21
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/52; H01J61/30; H01J61/33
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
A lamp as in claim 1 wherein said means is provided by the shape of said burner surface itself, said burner being shaped to provide increased surface area in the region of said higher portion, whereby greater heat dissipation is effected than in said lower portion with resulting lower temperature in said higher portion.
Claim 2
Dependent Claim
62 words
A lamp as claimed in claim 1 wherein said means is afforded by the shape of said envelope, said envelope being shaped to provide lower surface area in the region of said higher portion than in the region of said lower portion, whereby heat in said higher portion is dissipated at a greater rate than in the region of said lower portion.
Claim 3
Dependent Claim
32 words
A lamp as claimed in claim 3 wherein the space between said higher portion and said envelope has a smaller mean thickness than the space between said lower portion and the envelope.
Claim 4
Dependent Claim
47 words
A lamp as claimed in claim 2 wherein the surface of the burner in and between said higher and lower portions is of frusto-conical shape, the larger cross-sectional portions thereof being disposed above the smaller cross-sectional portions in Use, the said envelope being of uniform cylindrical shape.
Claim 5
Dependent Claim
31 words
A lamp as claimed in claim 2 wherein said higher and lower portions are of cylindrical shape, said higher portion having a larger diameter than said lower portion, same as above.
Claim 6
Dependent Claim
32 words
A lamp as claimed in claim 3 wherein said envelope has a smaller internal diameter adjacent said higher portion than adjacent said lower portion, the said burner being of uniform cylindrical shape.
Claim 7
Dependent Claim
50 words
A lamp as claimed in claim 7 wherein adjacent and between said higher and lower portions the shape of the internal surface of the envelope is frusto-conical and the larger cross-sectional portions thereof are located below the smaller cross-sectional portions in use, the said burner being of uniform cylindrical shape.
Claim 8
Dependent Claim
28 words
A lamp as claimed in claim 7, wherein said envelope has cylindrical internal higher and lower portions, said higher portion having a smaller diameter than said lower portion.
Claim 9
Dependent Claim
34 words
A lamp as claimed in claim 1 wherein said means comprises a scavenging device for directing a fluid on to the higher portion of said burner but not directly on to said lower portion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |