US3897935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of a photographic emulsion
Assignee: Eastman Kodak Co
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Filing: 1974-08-29
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Granted: 1975-08-05
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Expires: 1994-08-29
Abstract
Abstract Apparatus is disclosed in which each of a silver salt and halide salt or other salt solution is separately diluted with a part of a peptizer solution but remote from the bulk of the latter. These separate mixtures are then comixed and returned to the bulk peptizer solution. By the diluting and comixing of the reactants with a part of the bulk peptizer solution outside of the bulk vessel, greater control can be exercised with respect to a variety of parameters, irrespective of the bulk size of the peptizer solution.
Inventors
- 👤 Donald M Forster
- 👤 Gerald J Culhane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; B; B01; B01F; B01F25/00; B01F25/30; B01F25/31; B01F25/311; B01F25/50; B01F25/53; G03C2200/00; G03C2200/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
Apparatus for preparing a photographic emulsion, the combination comprising: first means for containing a bulk quantity of a peptizer solution; second means for containing a bulk quantity of a salt solution; third means for containing a bulk quantity of a silver salt solution; means operatively connected to the first means for moving the peptizer solution in a prescribed flow path; means arranged in the flow path and interconnected between the first means and the moving means for dividing the flow of peptizer solution between each of two separate and discrete chambers for a predetermined length of the flow path after which the divided flows combine; means interconnecting the second means to one of the chambers for introducing a flow of the salt solution into the one chamber for mixing with the flow of peptizer solution being moved therethrough; and means interconnecting the third means to the other of the chambers for introducing a flow of the silver salt solution into the other chamber for mixing with the flow of peptizer solution being moved therethrough; the combined divided flows mixing and precipitating the emulsion.
Claim 2
Dependent Claim
183 words
Apparatus for preparing a photographic emulsion, the combination comprising: first means for containing a bulk quantity of a peptizer solution; second means for containing a bulk quantity of a salt solution; third means for containing a bulk quantity of a silver salt solution; means operatively connected to the first means for moving the peptizer solution in a prescribed flow path; means arranged in the flow path and interconnected between the first means and the moving means for dividing the flow of peptizer solution between each of two separate and discrete chambers for a predetermined length of the flow path after which the divided flows combine; means interconnecting the second means to one of the chambers for introducing a flow of the salt solution into the one chamber for mixing with the flow of peptizer solution being moved therethrough; and means interconnecting the third means to the other of the chambers for introducing a flow of the silver salt solution into the other chamber for mixing with the flow of peptizer solution being moved therethrough; the combined divided flows mixing and precipitating the emulsion.
Claim 3
Dependent Claim
67 words
Apparatus in accordance with claim 1 wherein the moving means comprises a pump for moving the peptizer solution through the flow path defined by a conduit, and the dividing means comprises a plate of predetermined length arranged within a portion of the conduit for dividing the flow of peptizer solution being moved therethrough and for dividing the portion of the conduit into two separate and distinct chambers.
Claim 4
Dependent Claim
33 words
Apparatus in accordance with claim 2 wherein the introducing means are interconnected to their respective chamber at substantially the same position axially of the conduit and relative to the length of the plate.
Claim 5
Dependent Claim
31 words
Apparatus in accordance with claim 2 wherein the introducing means are interconnected to their respective chamber at different positions axially of the conduit and relative to the length of the plate.
Claim 6
Dependent Claim
24 words
Apparatus in accordance with claim 2 wherein the plate is arranged in the portion of the conduit connecting the first means to the pump.
Claim 7
Dependent Claim
53 words
Apparatus in accordance with claim 1 wherein the introducing means for the flow of salt solution and for the flow of silver salt solution are interconnected to their respective chamber so as to introduce the solutions at an angle to the direction of flow of the peptizer solution being moved through the chambers.
Claim 8
Dependent Claim
21 words
Apparatus in accordance with claim 6 wherein the angle is generally normal to the direction of flow of the peptizer solution.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |