US3987331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet emitting fluorescent lamp having internal reflector film
Assignee: GTE Sylvania Inc
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Filing: 1975-03-24
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Granted: 1976-10-19
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Expires: 1995-03-24
Abstract
Abstract An ultraviolet emitting fluorescent lamp contains an internal reflector film to increase the forward flux of the lamp. The reflector film comprises a layer of zirconia on the inside glass wall of the lamp envelope.
Inventors
- 👤 Willy P. Schreurs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:18
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/006; C03C17/007; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/22; C03C2217/40; C03C2217/43; C03C2217/44; C03C2217/45; C03C2217/46; C03C2217/47; C03C2217/475; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/114
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A fluorescent arc discharge lamp comprising a tubular glass envelope, a reflector film on a major portion of the internal wall of the envelope, the reflector film being an efficient reflector of long-ultraviolet radiation, a long-ultraviolet emitting phosphor coating on the reflector film, and means in the envelope for generating 2537 angstrom radiation, wherein the reflector film comprises zirconium dioxide and wherein the zirconium dioxide has a particle size less than about 0.05 microns.
Claim 2
Dependent Claim
74 words
A fluorescent arc discharge lamp comprising a tubular glass envelope, a reflector film on a major portion of the internal wall of the envelope, the reflector film being an efficient reflector of long-ultraviolet radiation, a long-ultraviolet emitting phosphor coating on the reflector film, and means in the envelope for generating 2537 angstrom radiation, wherein the reflector film comprises zirconium dioxide and wherein the zirconium dioxide has a particle size less than about 0.05 microns.
Claim 3
Dependent Claim
15 words
The lamp of claim 1 wherein the compactness of the reflector film is about 1.2.
Claim 4
Dependent Claim
13 words
The lamp of claim 1 wherein the phosphor is lead activated barium mesosilicate.
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |