Patent US4918577A successfully refreshed from Google Patents.
US4918577A
Expired / Lapsed
US
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Illumination light transmitting device
Assignee: Alps Alpine Co Ltd
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Filing: 1988-09-15
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Granted: 1990-04-17
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Expires: 2008-09-15
Abstract
Abstract An illumination light transmitting device comprising a rectangular illumination light transmitting body and a light source disposed outside an illumination range of the body or at an end portion of the body. The body has an illuminating portion formed with an oblique surface at the other end portion of the body on the opposite side of the light source. The oblique surface is formed with plural curved grooves. The light from the light source is transmitted through the body and is reflected on the curved grooves in various directions, thereby ensuring uniform illumination with effective irregular reflection.
Inventors
- 👤 Mitsuru Furudate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:28
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0013; G02B6/0015; G02B6/0018; G02B6/0033; G02B6/0035; G02B6/0038; G02B6/0045; G02B6/0046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
An illumination light transmitting device comprising: an external light source; and a rectangular illumination light transmitting body having an upper portion including a substantially flat surface and a surface positioned so as to form an oblique angle with said flat surface and having a plurality of curved grooves formed therein, a lower portion having a substantially flat surface, and a light reflective side surface; wherein said external light source is disposed opposite said flat surface of said upper portion and light from said external light source is reflected by said side surface onto said surface having a plurality of curved grooves formed therein.
Claim 2
Dependent Claim
103 words
An illumination light transmitting device comprising: an external light source; and a rectangular illumination light transmitting body having an upper portion including a substantially flat surface and a surface positioned so as to form an oblique angle with said flat surface and having a plurality of curved grooves formed therein, a lower portion having a substantially flat surface, and a light reflective side surface; wherein said external light source is disposed opposite said flat surface of said upper portion and light from said external light source is reflected by said side surface onto said surface having a plurality of curved grooves formed therein.
References Cited (Backward Citations)
CA696000A
Cited
GB952388A
Cited
US3223833A
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US4257084A
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US4323951A
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US4729185A
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US4714983A
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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) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |