Patent US4233397A successfully refreshed from Google Patents.
US4233397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of coupler dispersions
Assignee: Fujifilm Holdings Corp
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Filing: 1979-05-29
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Granted: 1980-11-11
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Expires: 1999-05-29
Abstract
Abstract A process for preparing a coupler dispersion comprising contacting a coupler dispersion containing an auxiliary solvent with an auxiliary solvent carrying fluid medium through a hydrophobic macroporous film made of polytetrafluroethylene or polypropylene.
Inventors
- 👤 Sugihiko Tada
- 👤 Yuzo Inukai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:35
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
88 words
A process for removing an auxiliary solvent from a hydrophilic colloid coupler dispersion containing an auxiliary solvent having a boiling point in the range of 60°-100° C. which comprises contacting the hydrophilic colloid coupler dispersion containing the auxiliary solvent with an auxiliary solvent-carrying fluid medium through a hydrophobic macroporous film made of polytetrafluroethylene or polypropylene permeable to the auxiliary solvent and impermeable to the hydrophilic colloid, whereby the auxiliary solvent diffuses from the hydrophilic colloid coupler dispersion through the hydrophobic macroporous film into the auxiliary solvent-carrying fluid medium.
Claim 2
Dependent Claim
88 words
A process for removing an auxiliary solvent from a hydrophilic colloid coupler dispersion containing an auxiliary solvent having a boiling point in the range of 60°-100° C. which comprises contacting the hydrophilic colloid coupler dispersion containing the auxiliary solvent with an auxiliary solvent-carrying fluid medium through a hydrophobic macroporous film made of polytetrafluroethylene or polypropylene permeable to the auxiliary solvent and impermeable to the hydrophilic colloid, whereby the auxiliary solvent diffuses from the hydrophilic colloid coupler dispersion through the hydrophobic macroporous film into the auxiliary solvent-carrying fluid medium.
Claim 3
Dependent Claim
29 words
The process according to claim 1, wherein the coupler dispersion containing the auxiliary solvent is in a sol state when the coupler dispersion contacts the auxiliary solvent-carrying fluid medium.
Claim 4
Dependent Claim
28 words
The process according to claim 1, wherein the coupler dispersion containing the auxiliary solvent is a gel state when the coupler dispersion contacts the auxiliary solvent-carrying fluid medium.
Claim 5
Dependent Claim
18 words
The process according to claim 1, wherein said auxiliary solvent-carrying fluid medium is a liquid or a gas.
Claim 6
Dependent Claim
23 words
The process according to claim 1, wherein said process includes flowing the auxiliary solvent-carrying fluid medium into contact with said hydrophobic macroporous film.
Claim 7
Dependent Claim
26 words
The process according to claim 1, wherein said auxiliary solvent-carrying fluid medium is water, an aqueous solution, air or another inert gas saturated with water vapor.
Claim 8
Dependent Claim
41 words
The process according to claim 1, wherein said process comprises passing said coupler dispersion through a tube of said hydrophobic macroporous film and passing said auxiliary solvent-carrying fluid medium into contact with said hydrophobic macroporous film countercurrently to said coupler dispersion.
Claim 9
Dependent Claim
23 words
The process according to claim 7, wherein said auxiliary solvent-carrying fluid medium is vapor, air or another inert gas saturated with water vapor.
Claim 10
Dependent Claim
59 words
The process according to claim 1, wherein said process comprises passing said coupler dispersion into a space surrounded by said hydrophobic macroporous film, gelling said coupler dispersion therein and passing said auxiliary solvent-carrying fluid medium into contact with said hydrophobic macroporous film on the opposite surface of said hydrophobic macroporous film to the surface contacting said gelled coupler dispersion.
Claim 11
Dependent Claim
14 words
The process of claim 1, wherein said hydrophobic macroporous film is made of polytetrafluoroethylene.
Claim 12
Dependent Claim
14 words
The process of claim 1, wherein said hydrophobic macroporous film is made of polypropylene.
Claim 13
Dependent Claim
21 words
The process according to claim 1, wherein said hydrophobic macroporous film has an average pore size of 0.1 to 40 microns.
Claim 14
Dependent Claim
19 words
The process of claim 12, wherein said hydrophobic macroporous film has a pore size of 0.1 to 5 microns.
Claim 15
Dependent Claim
19 words
The process of claim 13, wherein said hydrophobic macroporous film has a pore size of 0.2 to 2 microns.
Claim 16
Dependent Claim
20 words
The process of claim 1, wherein the pressure difference across said hydrophobic macroporous film is below the water entry pressure.
Claim 17
Dependent Claim
21 words
The process of claim 1, wherein the pressure difference across said hydrophobic macroporous film is 0.5 to 1.0 kg/cm 2 .
Claim 18
Dependent Claim
19 words
The process of claim 11, wherein the pressure difference across said hydrophobic film is below the water entry pressure.
Claim 19
Dependent Claim
23 words
The process of claim 11, wherein the pressure difference across said hydrophobic macroporous film is about 0.5 to about 1.0 kg/cm 2 .
Claim 20
Dependent Claim
14 words
The process of claim 12, wherein the film thickness is 20 to 1,000 microns.
Claim 21
Dependent Claim
14 words
The process of claim 18, wherein the film thickness is 20 to 1,000 microns.
Claim 22
Dependent Claim
40 words
The process of claim 12, wherein said process comprises passing said coupler dispersion through a tube of said hydrophobic macroporous film and passing said auxiliary solvent-carrying fluid medium into contact with said hydrophobic macroporous film countercurrently to said coupler dispersion.
Claim 23
Dependent Claim
40 words
The process of claim 18, wherein said process comprises passing said coupler dispersion through a tube of said hydrophobic macroporous film and passing said auxiliary solvent-carrying fluid medium into contact with said hydrophobic macroporous film countercurrently to said coupler dispersion.
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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |