Patent US4304835A successfully refreshed from Google Patents.
US4304835A
Expired / Lapsed
US
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Image receiving elements
Assignee: Polaroid Corp
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Filing: 1979-08-24
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Granted: 1981-12-08
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Expires: 1999-08-24
Abstract
Abstract A receiving element for use in an additive color photographic diffusion transfer process which comprises a transparent support carrying an additive color screen and a layer comprising noble metal silver precipitating nuclei and a polymer; wherein said nuclei are present in a level of about 0.1-0.3 mgs/ft 2 , and said polymer is present at a level of from about 0.5 to 5 times the coverage of said nuclei. Preferably, the noble metal is obtained by reduction of a noble metal salt or complex, and more preferably, the noble metal is palladium.
Inventors
- 👤 Stanley M. Bloom
- 👤 Boris Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:31
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/30; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
An additive diffusion transfer film unit consisting essentially of a transparent support carrying, in order, an additive color screen, a silver precipitating layer comprising noble metal silver precipitating nuclei and a polymer; wherein said nuclei are present in a level of about 0.1-0.3 mgs/ft 2 ; and said polymer is present at a level of from about 0.5 to 5 times the coverage of said nuclei and said layer being not more than about 2 mgs/ft 2 ; wherein said silver precipitating layer is the sole layer containing silver precipitating nuclei; and a photosensitive silver halide emulsion layer.
Claim 2
Dependent Claim
98 words
An additive diffusion transfer film unit consisting essentially of a transparent support carrying, in order, an additive color screen, a silver precipitating layer comprising noble metal silver precipitating nuclei and a polymer; wherein said nuclei are present in a level of about 0.1-0.3 mgs/ft 2 ; and said polymer is present at a level of from about 0.5 to 5 times the coverage of said nuclei and said layer being not more than about 2 mgs/ft 2 ; wherein said silver precipitating layer is the sole layer containing silver precipitating nuclei; and a photosensitive silver halide emulsion layer.
Claim 3
Dependent Claim
20 words
The product of claim 1 wherein said nuclei are obtained by the reduction of a noble metal salt or complex.
Claim 4
Dependent Claim
18 words
The product of claim 2 wherein said reduction is effected by a first metal capable of two valences.
Claim 5
Dependent Claim
19 words
The product of claim 1 wherein said nuclei are present at a level of about 0.2 mgs/ft 2 .
Claim 6
Dependent Claim
10 words
The product of claim 1 wherein said polymer is gelatin.
Claim 7
Dependent Claim
11 words
The product of claim 1 wherein said polymer is hydroxyethyl cellulose.
Claim 8
Dependent Claim
20 words
The product of claim 1 wherein said polymer present at a level of about 1 times that of the nuclei.
Claim 9
Dependent Claim
19 words
The product of claim 5 wherein said nuclei is present at a level of about 0.2 mgs/ft 2 .
Claim 10
Dependent Claim
13 words
The product as defined in claim 1 wherein said noble metal is palladium.
Claim 11
Dependent Claim
13 words
The product as defined in claim 3 wherein said first metal is tin.
Claim 12
Dependent Claim
23 words
The product as defined in 10 wherein said noble metal salt is palladous chloride and said first metal is provided by stannous chloride.
Claim 13
Dependent Claim
23 words
The product as defined in 10 wherein said noble metal salt is palladous chloride and said first metal is provided by stannous chloride.
Claim 14
Dependent Claim
10 words
The product of claim 1 which includes an antihalation layer.
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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |