Patent US4420709A successfully refreshed from Google Patents.
US4420709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp employing means for controlling emission of short wavelength ultraviolet radiation
Assignee: Osram Sylvania Inc
•
Filing: 1981-11-09
•
Granted: 1983-12-13
•
Expires: 2001-11-09
Abstract
Abstract Fluorescent lamp for bio-medical treatment of skin disorders includes a layer 28 of phosphor within the lamp which phosphor absorbs short wavelength U.V. radiation and re-emits the absorbed energy at a longer wavelength.
Inventors
- 👤 Kendrick D. Rattray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:16
CPC Classifications
A; A61; A61N; A61N5/00; A61N5/06; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/48
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A fluorescent lamp useful in the biomedical treatment of skin disorders, said lamp comprising means for generating a relatively broad spectrum of ultra violet radiation including desirable long wavelength radiation and less desirable short wavelength radiation, the improvement comprising: a layer of a first phosphor within said lamp, said first phosphor being adhered to the interior surface of said lamp and absorbing said short wavelength radiation and re-emitting this absorbed energy as said long wavelength radiation; said means for generating said relatively broad spectrum of ultraviolet radiation including a low pressure mercury arc discharge and a second layer of phosphor overlying said first phosphor.
Claim 2
Dependent Claim
104 words
A fluorescent lamp useful in the biomedical treatment of skin disorders, said lamp comprising means for generating a relatively broad spectrum of ultra violet radiation including desirable long wavelength radiation and less desirable short wavelength radiation, the improvement comprising: a layer of a first phosphor within said lamp, said first phosphor being adhered to the interior surface of said lamp and absorbing said short wavelength radiation and re-emitting this absorbed energy as said long wavelength radiation; said means for generating said relatively broad spectrum of ultraviolet radiation including a low pressure mercury arc discharge and a second layer of phosphor overlying said first phosphor.
Claim 3
Dependent Claim
15 words
The lamp of claim 1 wherein said first phosphor is an europium activated strontium fluoroborate.
References Cited (Backward Citations)
US3987331A
Cited
US4251750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |