Patent US3850810A successfully refreshed from Google Patents.
Patent US3825943A successfully refreshed from Google Patents.
US3825943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer apparatus
Assignee: Clark A Ltd
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Filing: 1972-09-25
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Granted: 1974-07-23
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Expires: 1992-09-25
Abstract
Abstract A trough for holding photographic processing chemicals. The trough comprises a rod which externally seals a longitudinal slot in the bottom of the trough, and a lever for moving the rod in an arcuate path away from the slot to allow rapid emptying of the chemicals from the trough.
Inventors
- 👤 R Masygan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:16
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/02; G03D13/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
211 words
A trough for holding a liquid processing chemicals comprising: an arcuate longitudinal wall and a pair of spaced end walls, the longitudinal wall having a slot therein extending substantially along the entire length of the lowermost portion thereof; a yieldable elongated sealing element positioned within the slot about its periphery and forming an elongated drain opening through which processing chemicals pass; an elongated movable sealing stopper rOd of circular cross section disposed below the longitudinal wall and parallel with the slot; the stopper rod having a length at least that of the opening and having a cross-sectional width greater than that of the opening; the sealing element having a surface which conforms to the contour of the rod when the adjacent surfaces of the sealing element and the rod come into contact to provide a tight sealing fit; lever means pivotally mounted to the end walls of the trough and having a lower end extending downwardly below the arcuate longitudinal wall, the stopper rod being directly engaged and supported by the lever means at the lower end thereof, whereby upon pivotal movement of the lever means the stopper rod is moved arcuately into and out of sealing engagement with the slot sealing element to open and close the elongated drain opening.
Claim 2
Dependent Claim
211 words
A trough for holding a liquid processing chemicals comprising: an arcuate longitudinal wall and a pair of spaced end walls, the longitudinal wall having a slot therein extending substantially along the entire length of the lowermost portion thereof; a yieldable elongated sealing element positioned within the slot about its periphery and forming an elongated drain opening through which processing chemicals pass; an elongated movable sealing stopper rOd of circular cross section disposed below the longitudinal wall and parallel with the slot; the stopper rod having a length at least that of the opening and having a cross-sectional width greater than that of the opening; the sealing element having a surface which conforms to the contour of the rod when the adjacent surfaces of the sealing element and the rod come into contact to provide a tight sealing fit; lever means pivotally mounted to the end walls of the trough and having a lower end extending downwardly below the arcuate longitudinal wall, the stopper rod being directly engaged and supported by the lever means at the lower end thereof, whereby upon pivotal movement of the lever means the stopper rod is moved arcuately into and out of sealing engagement with the slot sealing element to open and close the elongated drain opening.
Claim 3
Dependent Claim
36 words
A trough as claimed in claim 1 in which the lever means comprises a pair of lever bars pivotably mounted one adjacent each end of the trough on an axis lateral to and adjacent the slot.
Claim 4
Dependent Claim
28 words
A trough as claimed in claim 2 in which the lever bars are pivotably mounted on a pair of pins fixed on the end walls of the trough.
Claim 5
Dependent Claim
39 words
A trough as claimed in claim 2 including a handle bar extending parallel to the trough fixed to the lever bars remote from the stopper rod and forming with the lever bars and the rod a rigid pivotable frame.
Claim 6
Dependent Claim
59 words
A trough as claimed in claim 1, wherein the sealing element comprises a pair of strip gaskets fixed in the slot in opposed relationship and engageable with the sealing stopper rod when the rod is moved into the slot; and one of the sides of the slot being chamfered to permit unobstructed arcuate movement of the elongated stopper rod.
Claim 7
Dependent Claim
47 words
A trough as claimed in claim 1 in which the longitudinal wall of the trough comprises a pair of co-axial annular shells forming a pair of closed chambers separated by the slot, and inlet and outlet means opening into each chamber for circulation of temperature controlling liquid.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |