Patent US3749573A successfully refreshed from Google Patents.
US3749573A
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US
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Silver halide photosensitive element containing hydrophilic colloid layers hardened with alpha,beta-bis-acryloylamido-ethyleneglycol
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1971-08-03
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Granted: 1973-07-31
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Expires: 1991-08-03
Abstract
Abstract A HYDROPHILIC COLLOID PRESENT IN A PHOTOGRAPHIC LAYER MATERIAL IS CROSSLINKED WITH A,B-BIS-ACRYLOYLAMIDO-ETHYLENEGLYCOL OR A,B-BIS-METHACRYLOYLAMIDO-ETHYLENEGLYCOL.
Inventors
- 👤 A Froehlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30
Claims Analysis
Total Claims: 0
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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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |