US2854600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure mercury-vapour discharge lamp
Assignee: US Philips Corp
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Filing: 1956-08-09
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Granted: 1958-09-30
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Expires: 1976-08-09
Abstract
No abstract record available.
Inventors
- 👤 Martinus Henricus Adrianu Weij
- 👤 Wanmaker Willem Lambertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:31
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C09; C09K; C09K11/00; C09K11/02; C09K11/025; H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/20; H01H50/22; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/212
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A MERCURY-VAPOR DISCHARGE LAMP COMPRISING AN ENVELOPE HAVING WALL PORTIONS AND CONTAINING A GAS FILLING INCLUDING MERCURY VAPOR, A FLUORESCENT LAYER IN SAID ENVELOPE AND RESPONSIVE TO ULTRA-VIOLET RADIATION, AND A SINGLE REFLECTING LAYER DISPOSED BETWEEN A PORTION OF THE FLUORESCENT LAYER AND THE ENVELOPE WALL, SAID REFLECTING LAYER BEING CONSTITUTED OF NON-METALLIC POWDER PARTICLES HAVING A GRAIN SIZE LESS THAN ONE MICRON AND HAVING AN INDEX OF REFRACTION FOR VISIBLE LIGHT OF MORE THAN 1.9.
Claim 2
Dependent Claim
76 words
A MERCURY-VAPOR DISCHARGE LAMP COMPRISING AN ENVELOPE HAVING WALL PORTIONS AND CONTAINING A GAS FILLING INCLUDING MERCURY VAPOR, A FLUORESCENT LAYER IN SAID ENVELOPE AND RESPONSIVE TO ULTRA-VIOLET RADIATION, AND A SINGLE REFLECTING LAYER DISPOSED BETWEEN A PORTION OF THE FLUORESCENT LAYER AND THE ENVELOPE WALL, SAID REFLECTING LAYER BEING CONSTITUTED OF NON-METALLIC POWDER PARTICLES HAVING A GRAIN SIZE LESS THAN ONE MICRON AND HAVING AN INDEX OF REFRACTION FOR VISIBLE LIGHT OF MORE THAN 1.9.
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |