US3629641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure mercury vapor discharge lamp containing amalgam
Assignee: Osram GmbH
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Filing: 1970-07-16
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Granted: 1971-12-21
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Expires: 1990-07-16
Abstract
Abstract A low-pressure mercury vapor fluorescent lamp containing amalgams at three different locations in order to extend the temperature range of maximum light output. The main amalgam is indium with a weight ratio of indium to mercury from 12:1 to 3:1 located at places within the lamp having temperatures from 80* to 110* C. The two additional or runup amalgams are located at places within the lamp envelope which are much hotter than the main amalgam and which attain their operating temperature successively and earlier than the main amalgam, for instance on the electrode cap and on the stem press.
Inventors
- 👤 Dieter Hofmann
- 👤 Bernhard Kuhl
- 👤 Erhard Rasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:51
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/72
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
A lamp as in claim 1 wherein the weight ratio of indium to mercury is 6:1.
Claim 2
Dependent Claim
31 words
A lamp as in claim 1 wherein the main amalgam or amalgam-forming metal is located in places within the lamp which during lamp operation attains a temperature of about 95* C.
Claim 3
Dependent Claim
29 words
A lamp as in claim 1 wherein the additional amalgams or the amalgam-forming metals are located closer to the electrodes than the main amalgam determining the operating vapor pressure.
Claim 4
Dependent Claim
24 words
A lamp as in claim 4, wherein the additional amalgams or amalgam-forming metals are attached to parts of low heat capacity within the lamp.
Claim 5
Dependent Claim
35 words
A lamp as in claim 1 wherein the main amalgam is located around the stem flare and the additional amalgams are located on a cap surrounding the electrodes and on the press of the stem.
Claim 6
Dependent Claim
25 words
A lamp as in claim 6 wherein the power input is in the range of 0.3 to 0.6 watts per centimeter of discharge path length.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |