US3607345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating photographic emulsion layers
Assignee: Eastman Kodak Co
•
Filing: 1968-04-26
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Granted: 1971-09-21
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Expires: 1988-04-26
Abstract
Abstract ted with corona discharge to effect adhesion of differently sensitized photographic silver halide emulsion layers to the polymer surface, the improvement for obtaining greater uniformity of coating and stability of the emulsion layers, comprising activating the polymeric surface with a corona discharge producing a surface tending to fog a silver halide emulsion layer immediately coated thereon, and at least about 30 minutes later but before the adhesive property of the polymeric surface has substantially decreased, coating at least one of the emulsion layers on the activated polymeric surface.
Inventors
- 👤 Donald B Thomas
- 👤 Richard W Wheeler
- 👤 Donald N Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/915; G03C1/775; G03C1/79
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
30 words
The process of claim 1 wherein the support is paper having polymeric surfaces on each side and the emulsion layers are gelatin-silver halide emulsion layers which contain color-forming coupler compounds.
Claim 2
Dependent Claim
19 words
The process of claim 2 wherein the polymeric surface on at least one side of the paper is polyethylene.
Claim 3
Dependent Claim
27 words
The process of claim 2 wherein the polymeric surface on at least one surface of the paper is polyethylene, polypropylene, an ethylene copolymer or a linear polyester.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the emulsion layers are coated simultaneously onto the corona activated polymer surface.
Claim 5
Dependent Claim
38 words
The process of claim 2 wherein one of the emulsion layers is coated just after corona activation of the polymer surface and the remaining emulsion layers are coated thereon at least about 30 minutes after the corona activation.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the sensitive layer is a gelatin-silver halide emulsion layer.
Claim 7
Dependent Claim
8 words
The light-sensitive element prepared according to claim 2.
Claim 8
Dependent Claim
8 words
The light-sensitive element prepared according to claim 5.
Claim 9
Dependent Claim
8 words
The light-sensitive element prepared according to claim 6.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the current frequency of the corona discharge is greater than about 200 Hz.
References Cited (Backward Citations)
US3222176A
Cited
US3117865A
Cited
US3266895A
Cited
US3411908A
Cited
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Cited
FR1460174A
Cited
GB1134211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |