Patent US5175441A successfully refreshed from Google Patents.
Patent US4744012A successfully refreshed from Google Patents.
US4744012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting assemblage
Assignee: Individual
•
Filing: 1985-11-05
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Granted: 1988-05-10
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Expires: 2005-11-05
Abstract
Abstract A lamp unit comprising a box-like body which is provided with one or more apertures covered with a sheet of material transparent to visible light and which houses a light source. In accordance with the invention the side (10) of the sheet (6) or sheets facing inwardly of the body (1) is, or are, covered totally or partially with a layer of a substance which fluoresces when irradiated with ultraviolet light, and the light source (7) is arranged to transmit ultraviolet light. In accordance with one preferred embodiment of the invention the sheet (6), or sheets, is, or are, made of a material which is transparent to visible light but impermeable to ultraviolet radiation.
Inventors
- 👤 Lars A. Bergkvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:45
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/20; G09F13/04; G09F13/0418; G09F13/0472; G09F19/00; G09F19/12; G09F19/20; G09F19/205
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
A lamp unit comprising a box-like body which is provided with at least one aperture covered with at least one sheet of material transparent to visible light, and which houses a light source, where the side (10) of said sheet (6) facing inwardly of the body (1) is at least partially covered with a layer of a substance which fluoresces when irradiated with ultraviolet light and where said light source (7,8,9) is arranged to transmit ultraviolet light characterized in that said at least one sheet (6) is made of a material transparent to visible light but impermeable to ultraviolet radiation, in that the substance comprises at least one paint which fluoresces when irradiated with ultraviolet light, thereby giving a visible light but which paint is transparent or dark when irradiated by visible light, and in that an image is applied to said sheet (6) by said paint which fluoresces in a visible colored light, whereby the image only is visible to an observer when the light source radiates ultraviolet light.
Claim 2
Dependent Claim
170 words
A lamp unit comprising a box-like body which is provided with at least one aperture covered with at least one sheet of material transparent to visible light, and which houses a light source, where the side (10) of said sheet (6) facing inwardly of the body (1) is at least partially covered with a layer of a substance which fluoresces when irradiated with ultraviolet light and where said light source (7,8,9) is arranged to transmit ultraviolet light characterized in that said at least one sheet (6) is made of a material transparent to visible light but impermeable to ultraviolet radiation, in that the substance comprises at least one paint which fluoresces when irradiated with ultraviolet light, thereby giving a visible light but which paint is transparent or dark when irradiated by visible light, and in that an image is applied to said sheet (6) by said paint which fluoresces in a visible colored light, whereby the image only is visible to an observer when the light source radiates ultraviolet light.
Claim 3
Dependent Claim
33 words
A lamp unit according to claim 1, characterized in that the light source (7, 8, 9) is arranged to transmit a high proportion of ultraviolet light in the wavelength band of 360-370 nanometers.
Claim 4
Dependent Claim
31 words
A lamp unit according to claim 1, characterized in that said sheet (6) provided with a uniform layer of one and the same substance which fluoresces when irradiated with ultraviolet light.
Claim 5
Dependent Claim
66 words
A lamp unit according to claim 1, characterized in that the lamp unit incorporates a plurality of apertures (3, 4, 5) covered with a sheet (6) and includes a plurality of light sources (7, 8, 9); and in that screening walls (16, 17) are arranged in said body (1) so as to screen the light from a light source from one or more of said apertures.
Claim 6
Dependent Claim
20 words
A lamp unit according to claim 1, wherein said image is in the form of text applied to said sheet.
References Cited (Backward Citations)
FR554288A
Cited
US2213868A
Cited
CH256732A
Cited
CH282567A
Cited
US2709863A
Cited
US2878606A
Cited
US3270201A
Cited
FR2011141A1
Cited
FR2138495A1
Cited
GB2040534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |