US4917994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic reflection print material with improved keeping properties
Assignee: Eastman Kodak Co
•
Filing: 1988-03-01
•
Granted: 1990-04-17
•
Expires: 2008-03-01
Abstract
Abstract Color photographic print materials are described in which the surface pH is between about 4.0 and 5.3. The photographic elements have improved keeping properties under adverse conditions of storage.
Inventors
- 👤 Alberto M. Martinez
- 👤 Ronald G. Olsen
- 👤 Gary W. Visconte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/035; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
A color photographic print material comprising a support, one or more gelatin silver halide emulsion layers having associated therewith one or more dye-forming couplers and optionally subbing layers, interlayers, and overcoat layers, wherein the silver halide emulsion side of the element has a surface pH of between 4.0 and 5.3.
Claim 2
Dependent Claim
50 words
A color photographic print material comprising a support, one or more gelatin silver halide emulsion layers having associated therewith one or more dye-forming couplers and optionally subbing layers, interlayers, and overcoat layers, wherein the silver halide emulsion side of the element has a surface pH of between 4.0 and 5.3.
Claim 3
Dependent Claim
28 words
A color photographic print material of claim 1 wherein the silver halide emulsion is a silver chloride or silver chlorobromide emulsion containing up to 20 mole percent bromide.
Claim 4
Dependent Claim
16 words
A color photographic print material of claim 2 wherein the emulsion is a silver chloride emulsion.
Claim 5
Dependent Claim
14 words
An element of claim 1 wherein the surface pH is between 4.7 and 5.1.
Claim 6
Dependent Claim
17 words
An element of claim 1 in which the gelatin layers have been hardened with an active hardener.
Claim 7
Dependent Claim
18 words
An element of claim 5 wherein the active hardener is a carbamoyl pyridinium compound or a bisformadinium compound.
References Cited (Backward Citations)
US4377634A
Cited
US4266016A
Cited
US4358534A
Cited
US4478929A
Cited
US4764453A
Cited
US4673632A
Cited
US4767698A
Cited
EP0315109A1
Cited
JPH01228437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |