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US3740540A
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US
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Dial illuminating device
Assignee: Panasonic Holdings Corp
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Filing: 1969-02-19
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Granted: 1973-06-19
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Expires: 1989-02-19
Abstract
Abstract A dial illuminating device for use in a dial device for a radio receiver or the like, which is capable of illuminating the dial plate uniformly and clearly.
Inventors
- 👤 K Takeichi
- 👤 S Hama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:13
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/02; H03J1/04; H03J1/044
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A dial illuminating device, comprising a light converting member of a transparent material having a trapezoidal configuration, one oblique surface of said converting member extending along one side of said converting member being adapted to irregularly reflect light-rays projected through one end surface of said light converting member, a dial plate positioned adjacent the oblique surface of said converting member opposing said one surface, a light source mounted adjacent said one end surface of said member to project light-rays on said one oblique surface of said member, and filter means interposed between said one end surface and said light source, said filter means comprising a plurality of transparent color sections which are aligned side-by-side in a predetermined direction, said filter means being movable in said predetermined direction for changing the color of light-rays projected on said one oblique surface of said member.
Claim 2
Dependent Claim
142 words
A dial illuminating device, comprising a light converting member of a transparent material having a trapezoidal configuration, one oblique surface of said converting member extending along one side of said converting member being adapted to irregularly reflect light-rays projected through one end surface of said light converting member, a dial plate positioned adjacent the oblique surface of said converting member opposing said one surface, a light source mounted adjacent said one end surface of said member to project light-rays on said one oblique surface of said member, and filter means interposed between said one end surface and said light source, said filter means comprising a plurality of transparent color sections which are aligned side-by-side in a predetermined direction, said filter means being movable in said predetermined direction for changing the color of light-rays projected on said one oblique surface of said member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |