Patent US4053206A successfully refreshed from Google Patents.
US4053206A
Expired / Lapsed
US
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Multiple function recording and readout system
Assignee: Personal Communications Inc
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Filing: 1976-08-12
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Granted: 1977-10-11
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Expires: 1996-08-12
Abstract
Abstract A plural function optical apparatus defined by first and second parallel lensfiche elements positioned with their emulsion sides facing each other and first and second parallel optical screens each spaced from and parallel to a respective face of the lensfiche. Two lighting sheet elements may be added to increase the number of functions (projection, recording).
Inventors
- 👤 George Johannus Yevick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:18
CPC Classifications
G; G03; G03B; G03B15/00; G03B21/00; G03B21/10; G03B21/11; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545; Y; Y10; Y10S; Y10S385/00; Y10S385/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A light-conducting sheet, comprising, a. a sheet of transparent material having an index of refraction N 2 , b. a first coating on both sides of said sheet having an index of refraction N 1 less than N 2 , c. said sheet having a plurality of light-conducting channels over its surface, d. a reflector positioned in each said channel at approximately 45°, whereby light passing along one of the channels is reflected out from the channel in a direction normal to the sheet, said reflectors being positioned over the surface of said sheet, e. a second, opaque coating on both sides of said sheet and superposed on said first coating, said opaque coating being apertures on both sides at the said reflectors, and also being apertured on both sides adjacent each said reflector.
Claim 2
Dependent Claim
134 words
A light-conducting sheet, comprising, a. a sheet of transparent material having an index of refraction N 2 , b. a first coating on both sides of said sheet having an index of refraction N 1 less than N 2 , c. said sheet having a plurality of light-conducting channels over its surface, d. a reflector positioned in each said channel at approximately 45°, whereby light passing along one of the channels is reflected out from the channel in a direction normal to the sheet, said reflectors being positioned over the surface of said sheet, e. a second, opaque coating on both sides of said sheet and superposed on said first coating, said opaque coating being apertures on both sides at the said reflectors, and also being apertured on both sides adjacent each said reflector.
Claim 3
Dependent Claim
23 words
The light sheet of claim 1 including means at at least one end of said sheet to illuminate the ends of said channels.
Claim 4
Dependent Claim
16 words
The light sheet of claim 1 including means to illuminate at both ends of said sheet.
References Cited (Backward Citations)
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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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |