Patent US3630740A successfully refreshed from Google Patents.
US3630740A
Expired / Lapsed
US
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Antistatic layers for polymeric photographic supports
Assignee: Eastman Kodak Co
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Filing: 1969-10-24
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Granted: 1971-12-28
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Expires: 1989-10-24
Abstract
Abstract Photographic elements having polyolefin supports coated with silver halide emulsions highly sensitive to static discharges, are protected against static by coating a polyolefin surface with a mixture of a polyelectrolyte, a polyalkylene oxide and colloidal silica. The static protection obtained is substantially better then obtained by coating the polyolefin surface with any one or two of the three materials.
Inventors
- 👤 Douglas C Joseph
- 👤 William C Kerr
- 👤 Harold K Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/775; G03C1/79; G03C1/89; G03C1/895; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/19; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
about 16 to 35 percent by weight of a polyalkylene oxide of molecular weight of about 400 to 1,000, and
Claim 2
Dependent Claim
21 words
The support according to claim 1 wherein the polyolefin surface is modified by corona discharge for adhesion of the antistatic coating.
Claim 3
Dependent Claim
8 words
about 50-80 percent by weight of colloidal silica.
Claim 4
Dependent Claim
29 words
The photographic support according to claim 1 wherein the support is paper having polyolefin extrusion on each side and the antistatic coating is on one of the polyolefin surfaces.
Claim 5
Dependent Claim
26 words
The photographic support according to claim 2 wherein the polyolefin surface comprises polyethylene or polypropylene or a blend thereof, or a copolymer of ethylene and propylene.
Claim 6
Dependent Claim
15 words
The photographic support according to claim 4 wherein the polyalkylene oxide is a polyethylene oxide.
Claim 7
Dependent Claim
53 words
The photographic support according to claim 4 wherein the surface carrying the antistatic coating is polyethylene and the polyelectrolyte of the antistatic coating is an alkali metal or ammonium salt of either polymethacrylic acid, cellulose sulfate, polyvinyl phosphate or a partially esterified lactone of a vinyl alcohol- Alpha , Beta -dicarboxylic acid copolymer.
Claim 8
Dependent Claim
14 words
The element of claim 1 coated with at least one light-sensitive photographic emulsion layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |