US4309501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization process
Assignee: Eastman Kodak Co
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Filing: 1980-07-09
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Granted: 1982-01-05
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Expires: 2000-07-09
Abstract
Abstract Fine crystals characterized by improved morphological homogeneity and a narrow size distribution are prepared by introducing a solution of a crystallizable solute in a solvent into a bed of small inert continuously moving solid particles and initiating crystallization within the solution while it is in contact with the moving particles. The process finds application in the manufacture of diverse crystalline products such as, for example, in the formation of metal oxalates, phosphorescent compounds, and silver halide crystals, as well as in the purification of both organic and inorganic materials.
Inventors
- 👤 Albert P. Huguenard
- 👤 Michel J. Favre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:31
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/005; C01B35/08; C01B35/10; C01G; C01G5/00; C07; C07C; C07C51/00; C07C51/41; C07C51/412; C09; C09K; C09K11/00; G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
In a process of continuously preparing a radiation-sensitive silver halide emulsion wherein an aqueous silver salt solution and an aqueous halide salt solution capable of reacting to form radiation-sensitive silver halide grains are concurrently and separately introduced through inlets to a reaction chamber in the presence of a peptizer and radiation-sensitive silver halide emulsion is withdrawn at an outlet from the reaction chamber while silver halide grain formation is occurring under steady state operating conditions the improvement comprising reacting the silver salt and the halide salt within the reaction chamber in the presence of the peptizer in a bed of small, inert, continuously moving solid particles.
Claim 2
Dependent Claim
106 words
In a process of continuously preparing a radiation-sensitive silver halide emulsion wherein an aqueous silver salt solution and an aqueous halide salt solution capable of reacting to form radiation-sensitive silver halide grains are concurrently and separately introduced through inlets to a reaction chamber in the presence of a peptizer and radiation-sensitive silver halide emulsion is withdrawn at an outlet from the reaction chamber while silver halide grain formation is occurring under steady state operating conditions the improvement comprising reacting the silver salt and the halide salt within the reaction chamber in the presence of the peptizer in a bed of small, inert, continuously moving solid particles.
Claim 3
Dependent Claim
19 words
In a process according to claim 1 the further improvement wherein the particles are glass or organic polymer beads.
Claim 4
Dependent Claim
30 words
In a process according to claim 1 the further improvement wherein the particles are spherical and have a diameter in the range of from about 0.1 to about 10 millimeters.
Claim 5
Dependent Claim
26 words
In a process according to claim 3 the further improvement wherein the particles have a diameter in the range of from about 0.1 to 3 millimeters.
Claim 6
Dependent Claim
27 words
In a process according to claim 1 the further improvement wherein the inlets are located above the outlet and the direction of the liquid flow is downward.
Claim 7
Dependent Claim
18 words
In a process according to claim 1 the further improvement wherein the silver halide is a silver bromide.
Claim 8
Dependent Claim
17 words
In a process according to claim 1 the further improvement wherein the silver halide is silver chloride.
Claim 9
Dependent Claim
15 words
In a process according to claim 1 the further improvement wherein the peptizer is gelatin.
Claim 10
Dependent Claim
31 words
In a process according to claim 1 the further improvement wherein the residence time within the reaction chamber is in the range of from about 10 seconds to about 10 minutes.
Claim 11
Dependent Claim
31 words
In a process according to claim 9 the further improvement wherein the residence time within the reaction chamber is in the range of from about 20 seconds to about 5 minutes.
Claim 12
Dependent Claim
22 words
A process as claimed in claim 1 wherein the silver halide grains are formed in the presence of a sulfur-containing ripening agent.
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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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |