Patent US470919A successfully refreshed from Google Patents.
Patent US2503776A successfully refreshed from Google Patents.
US4178089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer
Assignee: Individual
•
Filing: 1977-12-29
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Granted: 1979-12-11
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Expires: 1997-12-29
Abstract
Abstract A photographic developer for sheet film arranged to feed the film through two or more interconnected chambers sealed by seals at the inlet of the first chamber and the outlet of the final chamber and also sealed at the interconnection of the chambers by means of seals which are preferably rotatable and controlled by a single motor, the seals preferably having rotatable valves at one end which control the inlet and outlet of developing and fixing agents as well as a drying gas.
Inventors
- 👤 Harry A. H. Spence-Bate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:32
CPC Classifications
G; G03; G03D; G03D15/00; G03D15/02; G03D15/027; G03D13/00; G03D13/02; G03D13/04; G03D3/00; G03D3/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A photographic developer comprising in combination: a first film receiving chamber, a second film receiving chamber in intercommunication with said first chamber, a fluid seal separating said chambers, a first chamber inlet seal, a second chamber outlet seal, wherein at least one of said seals comprises a rotatable gate formed as a cylinder with a longitudinal cut away section forming a passage through which film may be passed and wherein said chambers have fluid inlets for feeding fluids therethrough.
Claim 2
Dependent Claim
79 words
A photographic developer comprising in combination: a first film receiving chamber, a second film receiving chamber in intercommunication with said first chamber, a fluid seal separating said chambers, a first chamber inlet seal, a second chamber outlet seal, wherein at least one of said seals comprises a rotatable gate formed as a cylinder with a longitudinal cut away section forming a passage through which film may be passed and wherein said chambers have fluid inlets for feeding fluids therethrough.
Claim 3
Dependent Claim
38 words
A developer as claimed in claim 1 wherein said first chamber is above said second chamber and is aligned therewith so that a film being developed may be fed downwards from chamber to chamber past said fluid seal.
Claim 4
Dependent Claim
45 words
A developer as claimed in claim 1 wherein said seals at either end of the chambers are constructed so as to be rotatable by at least one motor, which motor or motors synchronously drive valve assemblies for controlling the feed of liquid into said chambers.
Claim 5
Dependent Claim
23 words
A developer as claimed in claim 3 wherein said valve assemblies are connected to and provided at one end of each rotatable seal.
Claim 6
Dependent Claim
17 words
A developer as claimed in claim 1 wherein at least one chamber is provided with an agitator.
Claim 7
Dependent Claim
27 words
A developer as claimed in claim 1 wherein at least one chamber is provided with a plurality of fluid supply ducts entering said chamber on opposed sides.
Claim 8
Dependent Claim
40 words
A developer as claimed in claim 6 wherein at least some of said fluid supply ducts are angled to said chamber so as to direct said fluid entering the chamber in a direction towards said film outlet of said chamber.
Claim 9
Dependent Claim
21 words
A developer as claimed in claim 1 including a fan arranged to blow a drying gas through at least one chamber.
References Cited (Backward Citations)
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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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |