Patent US3615552A successfully refreshed from Google Patents.
US3615552A
Expired / Lapsed
US
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Improved polyethylene-coated paper photographic material
Assignee: Agfa Gevaert AG
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Filing: 1969-11-12
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Granted: 1971-10-26
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Expires: 1989-11-12
Abstract
Abstract The bonding between the hydrophobic surface of a polyethylenecoated paper and the hydrophilic colloids used as binders for light-sensitive photographic emulsions can be established by means of an intermediate layer combination which comprises a layer of polymeric carbonic acid esters immediately coated on the polyethylene surface of the paper and a bonding layer of mixed acetals of polyvinyl alcohol and aldehydes with and without water-solubilizing groups.
Inventors
- 👤 Justus Danhauser
- 👤 Peter Kruck
- 👤 Werner Krafft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:19
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93; G03C1/775; G03C1/79
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
A photoGraphic material according to claim 1, in which the intermediate layer combination comprises a layer of polymeric carbonic acid esters based on 2,2-bis-(4-hydroxyphenyl)-propane and a bonding layer.
Claim 2
Dependent Claim
40 words
A photographic material according to claim 1, in which the bonding layer contains mixed acetals of polyvinyl alcohol and aldehydes with water-solubilizing groups and those without water solubilizing groups in admixture with partly saponified copolymers of vinyl chloride and ester.
Claim 3
Dependent Claim
16 words
A photographic material according to claim 3 in which the bonding layer contains a cross-linking agent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |