US4084339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated display apparatus
Assignee: Individual
•
Filing: 1976-06-25
•
Granted: 1978-04-18
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Expires: 1996-06-25
Abstract
Abstract An illuminated display apparatus includes a laser projector and a retro-reflective screen onto which the beam from the laser projector is projected. A beam deflection device may be disposed between the projector and the screen. The beam deflection device may be associated with a modulator for modulating the intensity of the light beam. A beam spreader and a mask may be substituted for the deflection device and modulator, the shadow of the mask appearing on the screen.
Inventors
- 👤 Raymond Peltier
- 👤 Jean-Paul Meric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:55
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/16; G09F13/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
An illuminated display apparatus comprising a roadway a retro-reflective screen means positioned near said roadway and visible from said roadway, at least one laser projector means for emitting at least one coherent light beam towards said retro-reflective screen means, and means interposed between said laser projector means and said retro-reflective screen means for acting upon the at least one coherent light beam to produce an intelligible display on said retro-reflective screen means.
Claim 2
Dependent Claim
72 words
An illuminated display apparatus comprising a roadway a retro-reflective screen means positioned near said roadway and visible from said roadway, at least one laser projector means for emitting at least one coherent light beam towards said retro-reflective screen means, and means interposed between said laser projector means and said retro-reflective screen means for acting upon the at least one coherent light beam to produce an intelligible display on said retro-reflective screen means.
Claim 3
Dependent Claim
15 words
An apparatus according to claim 1, wherein said screen comprises a layer of glass balls.
Claim 4
Dependent Claim
42 words
An apparatus according to claim 1, wherein said means for acting upon said at least one coherent light beam comprises beam deflection means for sweeping the said at least one coherent light beam over at least a part of said retro-reflective screen.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 3, wherein said screen comprises a layer of glass balls.
Claim 6
Dependent Claim
34 words
An apparatus according to claim 3, wherein said means for acting upon said at least one coherent light beam comprises additionally means for modulating the intensity of said at least one coherent light beam.
Claim 7
Dependent Claim
15 words
An apparatus according to claim 5, wherein said screen comprises a layer of glass balls.
Claim 8
Dependent Claim
39 words
An apparatus according to claim 1, wherein said means for acting upon the light beam comprises means for spreading said at least one coherent light beam, and mask means, the shadow of which is projected onto said retro-reflective screen.
Claim 9
Dependent Claim
15 words
An apparatus according to claim 7, wherein said screen comprises a layer of glass balls.
References Cited (Backward Citations)
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Cited
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US3090280A
Cited
US3161356A
Cited
US3790431A
Cited
US3844635A
Cited
US3802944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |