US4585730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic backing layer with auxiliary layer for a silver halide element
Assignee: Agfa Gevaert NV
•
Filing: 1985-01-16
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Granted: 1986-04-29
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Expires: 2005-01-16
Abstract
Abstract As part of a photographic film, a backing layer is coated with an auxiliary layer designed to conduct antistatic properties from an antistatic underlayer to the surface of the backing.
Inventors
- 👤 Thomas B. Cho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:44
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
A photographic film comprising a support, a silver halide emulsion layer on one side of said support, and an antistatic layer on the opposite side of said support, characterized in that the antistatic layer is coated with an auxiliary layer consisting essentially of a gelatin binder containing a conductive polymer in a concentration range of 0.3 to 10% by weight of the gelatin binder taken from the group consisting of poly(sodium styrene sulfonate), poly(cellulose sulfate), poly(dimethyl diallyl ammonium chloride), poly(sodium styrene sulfonate-maleic acid); poly(sodium styrene butyl methacrylate-butylacrylate-methacrylic acid) and poly(styrene sulfonic acid ammonium salt), coated on said antistatic layer at a pH of 5-8, whereby the antistatic properties of the antistatic layer are conducted through said auxiliary layer.
Claim 2
Dependent Claim
118 words
A photographic film comprising a support, a silver halide emulsion layer on one side of said support, and an antistatic layer on the opposite side of said support, characterized in that the antistatic layer is coated with an auxiliary layer consisting essentially of a gelatin binder containing a conductive polymer in a concentration range of 0.3 to 10% by weight of the gelatin binder taken from the group consisting of poly(sodium styrene sulfonate), poly(cellulose sulfate), poly(dimethyl diallyl ammonium chloride), poly(sodium styrene sulfonate-maleic acid); poly(sodium styrene butyl methacrylate-butylacrylate-methacrylic acid) and poly(styrene sulfonic acid ammonium salt), coated on said antistatic layer at a pH of 5-8, whereby the antistatic properties of the antistatic layer are conducted through said auxiliary layer.
Claim 3
Dependent Claim
15 words
The photographic film of claim 1 wherein the conductive polymer is a poly(sodium styrene sulfonate).
Claim 4
Dependent Claim
14 words
The photographic film of claim 1 wherein the conductive polymer is a poly(cellulose sulfate).
Claim 5
Dependent Claim
16 words
The photographic film of claim 1 wherein the conductive polymer is a poly(dimethyl diallyl) ammonium chloride).
Claim 6
Dependent Claim
16 words
The photographic film of claim 4 wherein the conductive polymer is a poly(sodium styrene sulfonate-maleic acid).
Claim 7
Dependent Claim
16 words
The photographic film of claim 1 wherein the conductive polymer is a poly(sodium styrene butylmethacrylate-butylacrylate-methacrylic acid).
Claim 8
Dependent Claim
19 words
The photographic film of claim 1 wherein the silver halide emulsion layer is covered with a protective overcoat layer.
Claim 9
Dependent Claim
18 words
The photographic film of claim 1 wherein the auxiliary layer also contains a crosslinking agent for the binder.
References Cited (Backward Citations)
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Cited
US3786001A
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US4374924A
Cited
US4225665A
Cited
US4407937A
Cited
US4396708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |