Patent US4334768A successfully refreshed from Google Patents.
US4334768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receptacle for negative carriers
Assignee: Professional Photo Products Inc
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Filing: 1980-07-28
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Granted: 1982-06-15
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Expires: 2000-07-28
Abstract
Abstract A flat receptacle to be mounted on a photographic enlarger to receive negative carriers. The receptacle has openings in the top and bottom walls to enable passage of light and a slot in one side wall enables insertion of a negative carrier. Means, such as holes in the bottom wall, interlock with complementary pins or the like on the bellows. The light source housing is lowered to clamp the receptacle in place for extended use, and the negatives may be inserted in the slotted side wall without raising and lowering the lamp house.
Inventors
- 👤 Michael H. Parik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:14
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/62; G03B27/6271
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
For installation in a photographic enlarger wherein a negative in a rigid frame-carrier is positioned between a light source housing and a bellows: a flat receptacle having rectangular top and bottom walls with openings therein for transmission of light; blocks on the lower surface of said bottom wall on opposite sides of the opening therein adapted to engage snugly in and interlock with the opening in the top mounting plate of an enlarger bellows with the outer edges of said blocks engaging the inner edges of said mounting plate opening to prevent horizontal displacement of said receptacle, and a slot in a side wall to receive a negative carrier.
Claim 2
Dependent Claim
109 words
For installation in a photographic enlarger wherein a negative in a rigid frame-carrier is positioned between a light source housing and a bellows: a flat receptacle having rectangular top and bottom walls with openings therein for transmission of light; blocks on the lower surface of said bottom wall on opposite sides of the opening therein adapted to engage snugly in and interlock with the opening in the top mounting plate of an enlarger bellows with the outer edges of said blocks engaging the inner edges of said mounting plate opening to prevent horizontal displacement of said receptacle, and a slot in a side wall to receive a negative carrier.
Claim 3
Dependent Claim
30 words
The receptacle defined by claim 1 including: three side walls having a short vertical dimension interconnecting said top and bottom walls; the fourth side being open to form said slot.
Claim 4
Dependent Claim
33 words
The receptacle defined by claim 1 wherein: said interlock means includes: a series of holes in said bottom wall to engage snugly over a complementary series of pins on said bellows mounting plate.
Claim 5
Dependent Claim
29 words
The receptacle defined by claim 1 wherein: said pair of opposing blocks have arcuate outer surfaces to fit and seat in a circular aperture in said bellows mounting plate.
References Cited (Backward Citations)
US2552225A
Cited
US2589680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |