Patent US3701900A successfully refreshed from Google Patents.
US3701900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for illuminating flat carriers with markings
Assignee: Canrad Precision Industries Inc
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Filing: 1969-06-11
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Granted: 1972-10-31
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Expires: 1989-06-11
Abstract
Abstract A device for illuminating flat carriers in accordance with the invention, characterized by the fact that the light produced by a radioactive light source is radiated upon the carrier consisting of a transparent material, the radiated light being totally reflected by a part of a main surface of the carrier, one main face of the carrier being adapted to reflect or disperse light at areas where markings appear, or at any areas other than those of the markings, in order to allow the light which is reflected or dispersed at these areas to escape through the other main face of the carrier.
Inventors
- 👤 Oscar Thuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:24
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/06; G; G04; G04B; G04B19/00; G04B19/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A device for illuminating transparent carriers having a narrow edge and a plurality of main surfaces, comprising a radioactive light source contiguous with at least a portion of said edge of said carrier; and marking upon selected zones of a main surface of said carrier, said marking serving to reflect and disperse light from said light source through another of said main surfaces, thereby producing a visible differentiation between unmarked and marked zones.
Claim 2
Independent Claim
73 words
A device for illuminating transparent carriers having a narrow edge and a plurality of main surfaces, comprising a radioactive light source contiguous with at least a portion of said edge of said carrier; and marking upon selected zones of a main surface of said carrier, said marking serving to reflect and disperse light from said light source through another of said main surfaces, thereby producing a visible differentiation between unmarked and marked zones.
Claim 3
Dependent Claim
39 words
A device in accordance with claim 1, wherein the radio-active light source comprises a hollow, gas-tight, fused glass body, the hollow space of which contains a luminophore and a radio-isotope selected from the group consisting of tritium and krypton.
Claim 4
Dependent Claim
20 words
A device in accordance with claim 1 wherein said marking on selected zones consists of a coating of light-colored paint.
Claim 5
Dependent Claim
16 words
A device in accordance with claim 1 wherein said marking on selected zones consists of roughing.
Claim 6
Dependent Claim
17 words
A device in accordance with claim 1 wherein said marking on selected zones consists of raised areas.
Claim 7
Dependent Claim
17 words
A device in accordance with claim 1 wherein said marking on selected zones consists of depressed areas.
Claim 8
Dependent Claim
20 words
A device in accordance with claim 1 wherein the carrier is a cover glass of an instrument, having markings thereon.
Claim 9
Dependent Claim
30 words
A device in accordance with claim 1 wherein that portion of the edge of the carrier through which no light passes into the carrier is provided with a reflecting layer.
Claim 10
Dependent Claim
33 words
A device in accordance with claim 1 wherein the radio-active light source consists of a layer of radioactive luminous paint applied to at least a portion of said narrow edge of the carrier.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |