Patent US3811767A successfully refreshed from Google Patents.
US3811767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable collapsible darkroom
Assignee: Individual
•
Filing: 1973-06-12
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Granted: 1974-05-21
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Expires: 1993-06-12
Abstract
Abstract A portable, collapsible darkroom comprising a housing formed of two hingedly attached sections opening up to overlie one another on the same plane, with a framework disposed within the housing and extensible therefrom to form, with the housing, a substantially rectangular enclosure, and a light-proof canopy enclosing the framework and housing interior. The housing interior supports a photographic enlarger and baseboard secured to, and vertically adjustable in respect of, a pair of aligned posts, and a series of developing trays removeably supported on the housing interior. Air circulation is provided by a blower and baffled vents, and light by a fixture, both secured to the housing interior and wired, with the enlarger, to a source of electricity outside the darkroom.
Inventors
- 👤 H Purnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:40
CPC Classifications
G; G03; G03D; G03D17/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A portable collapsible darkroom comprising a housing formed of a pair of substantially rectangular sections of identical size and shape comprising each a base and a surrounding wall extending at right angles from the base, the sections disposed, when secured together in closed position, to define an internal chamber for the housing, a hinge pivotally securing the sections together along abutting wall edges, the sections adapted, when fully opened, To stand one atop the other in the same plane to form the housing, a framework secured to and recessed within each of the sections in collapsed state and extensible therefrom to form, with the opened sections of the housing, and define therewith, a rigid room-sized enclosure, and a light-proof canopy removeably secured around the framework and the housing interior to define a darkroom.
Claim 2
Dependent Claim
133 words
A portable collapsible darkroom comprising a housing formed of a pair of substantially rectangular sections of identical size and shape comprising each a base and a surrounding wall extending at right angles from the base, the sections disposed, when secured together in closed position, to define an internal chamber for the housing, a hinge pivotally securing the sections together along abutting wall edges, the sections adapted, when fully opened, To stand one atop the other in the same plane to form the housing, a framework secured to and recessed within each of the sections in collapsed state and extensible therefrom to form, with the opened sections of the housing, and define therewith, a rigid room-sized enclosure, and a light-proof canopy removeably secured around the framework and the housing interior to define a darkroom.
Claim 3
Dependent Claim
73 words
A portable, collapsible darkroom as described in claim 1, a post secured in each of the sections, a photographic enlarger slideably and rotatively mounted on one of the posts, with means to activate the enlarger extending from the housing, a baseboard slideably mounted on the second post and in alignment with the enlarger, a plurality of developing trays and means within the housing to support the trays in spaced relationship to each other.
Claim 4
Dependent Claim
51 words
A portable, collapsible darkroom as described in claim 2, an exhaust blower secured in one end of the housing and air vents provided at the other end of the housing, a port in the housing wall in registry with the blower, and means to activate the blower extending from the housing.
Claim 5
Dependent Claim
24 words
A portable, collapsible darkroom as described in claim 3, baffles provided over the air vents to exclude light from entering through the air vents.
Claim 6
Dependent Claim
26 words
A portable, collapsible darkroom as described in claim 4, a safelight provided in the housing wall, with means to activate the safelight extending from the housing.
Claim 7
Dependent Claim
35 words
A portable, collapsible darkroom as described in claim 5, casters provided on the outer surfaces of adjoining walls of the housing, and a handle secured to the outer surfaces of opposing walls of the housing.
Claim 8
Dependent Claim
30 words
A portable, collapsible darkroom, as described in claim 5, the means to activate the enlarger, exhaust blower and safelight being on the same circuit, with individual activating switches for each.
References Cited (Backward Citations)
US1057417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |