US3879205A
Expired / Lapsed
US
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Method of preparing photosensitive silver halide emulsions
Assignee: Polaroid Corp
•
Filing: 1973-08-23
•
Granted: 1975-04-22
•
Expires: 1993-08-23
Abstract
Abstract A photosensitive silver halide emulsion wherein the emulsion binder comprises an amine-acrylamide polymer or copolymer.
Inventors
- 👤 Maurice J Fitzgerald
- 👤 Lloyd D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
8 words
A METHOD OF PREPARING A PHOTOSENSITIVE SILVER HALIDE
Claim 2
Independent Claim
8 words
A METHOD OF PREPARING A PHOTOSENSITIVE SILVER HALIDE
Claim 3
Independent Claim
42 words
A method of preparing a photosensitive silver halide emulsion which comprises reacting in the absence of gelatin a water-soluble silver salt with a water-soluble halide salt in an aqueous solution containing a polymer having in its structure repeating units of the formula:
Claim 4
Independent Claim
42 words
A method of preparing a photosensitive silver halide emulsion which comprises reacting in the absence of gelatin a water-soluble silver salt with a water-soluble halide salt in an aqueous solution containing a polymer having in its structure repeating units of the formula:
Claim 5
Dependent Claim
20 words
The method as defined in claim 1 wherein said polymer comprises a copolymer of a first monomer of the formula:
Claim 6
Dependent Claim
15 words
The method as defined in claim 2 wherein said first monomer is N-( Beta -(dimethylamino)ethyl)acrylamide.
Claim 7
Dependent Claim
13 words
The method as defined in claim 2 wherein said first monomer is N-(diethylaminomethyl)acrylamide.
Claim 8
Dependent Claim
12 words
The method as defined in claim 2 wherein said comonomer is acrylamide.
Claim 9
Dependent Claim
12 words
The method as defined in claim 2 wherein said comonomer is N-isopropylacrylamide.
Claim 10
Dependent Claim
12 words
The method as defined in claim 2 wherein said comonomer is acrylamidoacetamide.
Claim 11
Dependent Claim
19 words
The method as defined in claim 1 wherein said aqueous solution further comprises polyvinyl alcohol as a bodying polymer.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |