US4426798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparency viewing device
Assignee: Individual
•
Filing: 1981-04-08
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Granted: 1984-01-24
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Expires: 2001-04-08
Abstract
Abstract An illuminated transparency viewing device for viewing transparent loose-leaf pages and for sorting 35 mm slides. The device has a smooth viewing surface and a ribbed sorting surface on opposite sides of the device; wherein a double-sided reflector surface is hinged between the two sides so as to pivot from a first position, wherein light is reflected through the smooth viewing surface to a second position, wherein light is reflected through the ribbed sorting surface.
Inventors
- 👤 Carter A. Saunders
- 👤 Sherwood S. Brownlee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:55
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
An apparatus for viewing pages of transparencies in a loose-leaf book and for sorting individual transparencies, comprising: a housing which is generally wedge shaped in cross section, said housing have three sides and a top and bottom translucent viewing surface, said top surface being generally smooth for viewing said pages containing at least one of said transparencies, said bottom surface having spaced transverse ribs extending between two of said sides for permitting mounting, viewing and sorting of said individual transparencies; a hinged double sided reflector surface which is mounted on said housing where said top and bottom surfaces meet for pivotal movement between said surfaces; an internal light source for illuminating said top and bottom viewing surfaces; said apparatus being adaptable for use in a first position in which said smooth surface is inserted under a said page of transparencies for viewing, and a second position in which the ribbed surface faces up for viewing, sorting and mounting said individual transparencies, whereby said reflector surface pivots between the top and bottom surfaces as the apparatus is moved between said first and second positions.
Claim 2
Independent Claim
183 words
An apparatus for viewing pages of transparencies in a loose-leaf book and for sorting individual transparencies, comprising: a housing which is generally wedge shaped in cross section, said housing have three sides and a top and bottom translucent viewing surface, said top surface being generally smooth for viewing said pages containing at least one of said transparencies, said bottom surface having spaced transverse ribs extending between two of said sides for permitting mounting, viewing and sorting of said individual transparencies; a hinged double sided reflector surface which is mounted on said housing where said top and bottom surfaces meet for pivotal movement between said surfaces; an internal light source for illuminating said top and bottom viewing surfaces; said apparatus being adaptable for use in a first position in which said smooth surface is inserted under a said page of transparencies for viewing, and a second position in which the ribbed surface faces up for viewing, sorting and mounting said individual transparencies, whereby said reflector surface pivots between the top and bottom surfaces as the apparatus is moved between said first and second positions.
Claim 3
Dependent Claim
17 words
An apparatus as in claim 1 further comprising finger holes in said housing for carrying said apparatus.
Claim 4
Dependent Claim
31 words
An apparatus as in claim 1 or 2 further comprising said translucent viewing surfaces which are flexible so that said surfaces may be flexed for the replacement of said light source.
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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |