US3890045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic printing apparatus
Assignee: Individual
•
Filing: 1974-02-22
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Granted: 1975-06-17
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Expires: 1994-02-22
Abstract
Abstract A photographic reader-printer in which printing paper is held flat and supported for exposure by a vacuum platen operating against its back surface so that the sensitive side is down for receiving upwardly directed image illumination. A transparent vacuum platen having a frosted glass lower face is disclosed as an aid in focusing or aligning in the absence of printing paper.
Inventors
- 👤 Herbert J Bernstein
- 👤 William J Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:56
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11; G03B21/118; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
In a photographic printer-processor having a projector, a print exposure station, a roll-feed for providing printing paper to said exposure station and a processor for activating and stabilizing prints, the combination in said print exposure station comprising: a. A fixed vacuum platen positioned adjacent to and above the path of travel of printing paper for supporting and holding printing paper uniformly flat during exposure; b. a pair of edge support rails positioned below said vacuum platen providing a support surface for supporting printing paper within the pneumatic field of influence of said platen; c. a guide plate positioned following said vacuum platen in the path of travel of said printing paper, the lower surface of said vacuum platen proximate to and overlapping the top surface of said guide plate; and, d. a drive roller positioned above and coacting with said guide plate for driving said printing paper through said exposure station, said overlap providing vacuum pressure at the region of overlap.
Claim 2
Dependent Claim
161 words
In a photographic printer-processor having a projector, a print exposure station, a roll-feed for providing printing paper to said exposure station and a processor for activating and stabilizing prints, the combination in said print exposure station comprising: a. A fixed vacuum platen positioned adjacent to and above the path of travel of printing paper for supporting and holding printing paper uniformly flat during exposure; b. a pair of edge support rails positioned below said vacuum platen providing a support surface for supporting printing paper within the pneumatic field of influence of said platen; c. a guide plate positioned following said vacuum platen in the path of travel of said printing paper, the lower surface of said vacuum platen proximate to and overlapping the top surface of said guide plate; and, d. a drive roller positioned above and coacting with said guide plate for driving said printing paper through said exposure station, said overlap providing vacuum pressure at the region of overlap.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |