US3577029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure electric discharge device containing mercury, halogen, scandium and samarium
Assignee: GTE Sylvania Inc
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Filing: 1968-11-29
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Granted: 1971-05-04
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Expires: 1988-11-29
Abstract
Abstract A metal arc lamp, which emits all visible colors in the spectrum and has good red rendition, contains a fill including mercury, halogen, scandium and samarium. The lamp is an efficient producer of white light.
Inventors
- 👤 Frederic Koury
- 👤 John F Waymouth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:36
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
The device claim 1 wherein said samarium and said scandium are present in quantities of 4.6 X 10 7 to 1.1 X 10 5 gram atoms per centimeter of arc length.
Claim 2
Dependent Claim
24 words
The device of claim 2 wherein the atomic ratio of said samarium to said scandium is respectively between about 1 1/2 :1 and 1:2.
Claim 3
Dependent Claim
33 words
The device of claim 1 wherein said fill includes cesium, said cesium being present in quantities of 5.25 X 10 7 to 6.8 X 10 5 gram atoms per centimeter of arc length.
Claim 4
Dependent Claim
33 words
The device of claim 2 wherein said fill includes cesium, said cesium being present in quantities of 5.25 X 10 7 to 6.8 X 10 5 gram atoms per centimeter of arc length.
Claim 5
Dependent Claim
33 words
The device of claim 3 wherein said fill includes cesium, said cesium being present in quantities of 5.25 X 10 7 to 6.8 X 10 5 gram atoms per centimeter of arc length.
References Cited (Backward Citations)
US3407327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |