US3767448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic process
Assignee: Eastman Kodak Co
•
Filing: 1971-11-29
•
Granted: 1973-10-23
•
Expires: 1991-11-29
Abstract
Abstract A photographic element having improved matting properties is prepared by deionizing or deashing an aqueous gelatin solution containing at least about 5 percent by weight gelatin and then adding a matting agent which comprises discrete particles of a polymer containing free carboxyl groups to the resulting aqueous gelatin solution. The resulting gelatin solution containing the matting agent can be employed with other addenda employed in photographic materials. Deionizing can be carried out by passing the aqueous gelatin solution through an ion-exchange resin or deashing can be effected by washing the gelatin solution with an aqueous acid solution.
Inventors
- 👤 P Hutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:19
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The process of claim 1 wherein said matting agent is an alkyl acrylate polymer containing free carboxyl groups.
Claim 2
Dependent Claim
16 words
The process of claim 1 wherein said matting agent is copoly (methyl methacrylate - methacrylic acid).
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said matting agent is added to said gelatin solution in a concentration of about 0.5 percent to about 15 percent by weight of said gelatin solution.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said gelatin solution contains about 5 percent to about 20 percent by weight gelatin.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein said deionizing is carried out by passing said aqueous gelatin solution through an ion-exchange resin.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein said deashing is carried out by washing said gelatin solution with an aqueous acetic acid solution.
References Cited (Backward Citations)
GB528850A
Cited
US2322037A
Cited
US2391181A
Cited
GB837529A
Cited
US2992213A
Cited
US3370951A
Cited
US3411907A
Cited
US3687703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |