US4261125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparency block
Assignee: Rappaport Exhibits Inc
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Filing: 1979-09-04
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Granted: 1981-04-14
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Expires: 1999-09-04
Abstract
Abstract A transparency block is disclosed which is attractive in appearance and provides a maximum of image area for any given dimension of block. An important feature of the invention is the use of locking fingers of unique construction for holding transparencies firmly in the block, and without the need for tape or mechanical mounting. Another feature is the provision of a built-in circline fluorescent lamp for providing maximum illumination of the transparency at a minimum of energy expenditure or cost. The block may be hung horizontally or vertically, and is so designed that it may be used in isolated manner or grouped with other or similar blocks, as may be required. For this purpose, it has a built-in recessed outlet for uncluttered interconnection with other similar blocks.
Inventors
- 👤 Sherman L. Rappaport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:26
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/022; G02B27/024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
In a transparency block of the character described, a rectangular frame, a transparent panel disposed adjacent the front of said frame, a movable translucent panel adapted for movement toward said transparent panel for holding a transparency flat against said transparent panel, a rectangular panel for closing the rear of said frame, said rectangular panel adapted to be removably secured to said frame, and resilient locking fingers secured to said rectangular panel and of a length such that when said rectangular panel is in operative position, said fingers engage said translucent panel and lock the latter in transparency holding position.
Claim 2
Dependent Claim
99 words
In a transparency block of the character described, a rectangular frame, a transparent panel disposed adjacent the front of said frame, a movable translucent panel adapted for movement toward said transparent panel for holding a transparency flat against said transparent panel, a rectangular panel for closing the rear of said frame, said rectangular panel adapted to be removably secured to said frame, and resilient locking fingers secured to said rectangular panel and of a length such that when said rectangular panel is in operative position, said fingers engage said translucent panel and lock the latter in transparency holding position.
Claim 3
Dependent Claim
24 words
A transparency block, as defined in claim 1, wherein said locking fingers are resiliently biased into frictional engagement with inner surfaces of said frame.
Claim 4
Dependent Claim
18 words
A transparency block, as defined in claim 2, including a circular fluorescent lamp mounted on said closure panel.
Claim 5
Dependent Claim
24 words
A transparency block, as defined in claim 3, including a bracket mounted on said closure panel, and an electrical outlet supported by said bracket.
Claim 6
Dependent Claim
34 words
A transparency block, as defined in claim 4, including a cable for supplying electrical current to said outlet, and means on said closure panel for supporting said cable in a coiled or wound condition.
Claim 7
Dependent Claim
23 words
A transparency block, as defined in claim 5, including means on said closure panel for venting heat from the interior of the block.
Claim 8
Dependent Claim
17 words
A transparency block, as defined in claim 6, including means for hanging said block horizontally or vertically.
Claim 9
Dependent Claim
37 words
A transparency block, as defined in claim 7, wherein said closure panel is provided with a rearwardly extending peripheral flange, and means are provided for removably securing said flange to the top and bottom of said frame.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |