Patent US4143976A successfully refreshed from Google Patents.
US4143976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Washing trays
Assignee: Individual
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Filing: 1976-06-29
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Granted: 1979-03-13
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Expires: 1996-06-29
Abstract
Abstract A washing tray e.g. for washing photographic sheet material, consisting of a base and upstanding side walls, a weir at one end of the tray, means for introducing one or more streams of liquid into the tray to create a washing reservoir in the tray upstream of the weir and means for draining liquid from the washing tray on the downstream side of the weir. The dimensions of the parts of the tray and the direction of introduction of the stream(s) of liquid are such that currents in the liquid reservoir have a tendency to cover any object floating in the reservoir. This may be achieved by introducing a single stream of liquid into the angle between the base and the side wall most remote from the weir.
Inventors
- 👤 Donald M. Paterson, deceased
- 👤 executor by Ian R. E. Gow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:12
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/02; G03D13/04; G03D3/00; G03D3/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
In a washing tray for sheet material, having a base, upstanding walls and an inlet near one end, the improvement comprising: a weir positioned near the other end of the tray and adapted to maintain a liquid reservoir between said weir and said inlet; and an outlet for draining liquid on the downstream side of said weir; wherein said inlet has an angled end positioned in the angle between said base and the wall most remote from said weir, said angled end being adapted to debouch liquid onto said base and wall and cooperating therewith to cause a downstream current in said reservoir adjacent at least one of said sidewalls, said downstream current being diverted by said weir to cause an upstream current toward said inlet end in the center of said reservoir.
Claim 2
Dependent Claim
133 words
In a washing tray for sheet material, having a base, upstanding walls and an inlet near one end, the improvement comprising: a weir positioned near the other end of the tray and adapted to maintain a liquid reservoir between said weir and said inlet; and an outlet for draining liquid on the downstream side of said weir; wherein said inlet has an angled end positioned in the angle between said base and the wall most remote from said weir, said angled end being adapted to debouch liquid onto said base and wall and cooperating therewith to cause a downstream current in said reservoir adjacent at least one of said sidewalls, said downstream current being diverted by said weir to cause an upstream current toward said inlet end in the center of said reservoir.
Claim 3
Dependent Claim
27 words
A washing tray according to claim 1 wherein the floor of said reservoir inclines upwardly from the intersection of said weir and said base toward said inlet.
Claim 4
Dependent Claim
21 words
A washing tray according to claim 1 further comprising: a plurality of raised ribs positioned on the floor of said reservoir.
Claim 5
Dependent Claim
31 words
A washing tray according to claim 1 further comprising: at least one retainer demountably mounted on the floor of said reservoir and dividing said reservoir into a plurality of sheet-material-retaining areas.
Claim 6
Dependent Claim
159 words
A washing tray for sheet material comprising: an inclined based and upstanding side and end walls extending therefrom; an inlet positioned substantially along a center line of said tray near the higher end of said tray; a weir positioned near the lower end of said tray and adapted to maintain a liquid reservoir between said weir and said inlet; an outlet for draining liquid on the downstream side of said weir; said inlet having an angled end and a corresponding slanted opening facing the corner between said base and the end wall most remote from said weir, said inlet being adapted to debouch liquid onto said base and said wall and cooperating therewith to cause said liquid to flow along said end wall and to form downstream currents in said reservoir along the side walls of said tray, said downstream currents being diverted by said weir to form an upstream current toward said inlet and along said center line.
Claim 7
Dependent Claim
159 words
A washing tray for sheet material comprising: an inclined based and upstanding side and end walls extending therefrom; an inlet positioned substantially along a center line of said tray near the higher end of said tray; a weir positioned near the lower end of said tray and adapted to maintain a liquid reservoir between said weir and said inlet; an outlet for draining liquid on the downstream side of said weir; said inlet having an angled end and a corresponding slanted opening facing the corner between said base and the end wall most remote from said weir, said inlet being adapted to debouch liquid onto said base and said wall and cooperating therewith to cause said liquid to flow along said end wall and to form downstream currents in said reservoir along the side walls of said tray, said downstream currents being diverted by said weir to form an upstream current toward said inlet and along said center line.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |