Patent US3707792A successfully refreshed from Google Patents.
US3707792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphic display system
Assignee: Individual
•
Filing: 1971-07-19
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Granted: 1973-01-02
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Expires: 1991-07-19
Abstract
Abstract A display system for graphic indicia includes a source of illumination mounted in a cabinet having an open viewing side. A light-diffusion plate is mounted in the opening of the cabinet; and a glass plate having a low light transmissivity is mounted in front of the diffusion plate, and it forms part of the cabinet structure for the light source. A plastic plate bearing a negative reproduction of the indicia to be displayed is removably interposed between the diffusion plate and the glass plate; and there is provision for overlapping of opaque areas of superposed indicia-bearing plates to form a complete light seal except of the transparent indicia itself. A transparent color film of plate may, if desired, be interposed between the diffusion plate and the indicia plate or film.
Inventors
- 👤 L Mabrey
- 👤 R Fogelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:08
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/04; G09F13/0409
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A building directory system comprising: a cabinet provided with a front opening; a source of illumination mounted in said cabinet; a laminated faceplate mounted in said opening, said faceplate including first and second glass panels laminated together by a low light transmission film having a light transmissivity between 2 percent and 25 percent to thereby form an integral unit; a plurality of indicia-bearing film members behind said faceplace, each film member having transparent indicia on an opaque ground, each film member further being provided with means for sealing with adjacent members to prevent light leaks between adjacent members, all of said members cooperating to provide a uniform opaque ground and being individually replaceable; and a diffusion plate interposed between said indicia-bearing members and said source of illumination to provide a uniform field of illumination for said transparent indicia.
Claim 2
Dependent Claim
138 words
A building directory system comprising: a cabinet provided with a front opening; a source of illumination mounted in said cabinet; a laminated faceplate mounted in said opening, said faceplate including first and second glass panels laminated together by a low light transmission film having a light transmissivity between 2 percent and 25 percent to thereby form an integral unit; a plurality of indicia-bearing film members behind said faceplace, each film member having transparent indicia on an opaque ground, each film member further being provided with means for sealing with adjacent members to prevent light leaks between adjacent members, all of said members cooperating to provide a uniform opaque ground and being individually replaceable; and a diffusion plate interposed between said indicia-bearing members and said source of illumination to provide a uniform field of illumination for said transparent indicia.
Claim 3
Dependent Claim
87 words
The system of claim 1 wherein each of said film members is constructed and arranged to at least partially overlap adjacent such members for preventing light leaks, said display system being characterized by presenting a uniformly continuous ground for said indicia interposed between said light source and said faceplate whereby joints between adjacent of such film members are substantially invisible to an observer and the contrast seen by an observer at the indicia is enhanced by attenuation of the ambient light by said low light transmission film.
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |