Patent US3284207A successfully refreshed from Google Patents.
US3284207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic light-sensitive materials
Assignee: Ilford Imaging UK Ltd
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Filing: 1963-03-11
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Granted: 1966-11-08
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Expires: 1983-03-11
Abstract
No abstract record available.
Inventors
- 👤 Stonham John Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08F; C08F8/00; C08F8/04; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A PHOTOGRAPHIC COLLOID SILVER HALIDE EMULSION IN WHICH THE COLLOID CONSISTS AT LEAST IN PART OF A POLYACRYLAMIDE IN WHICH 2 TO 20% OF THE AMIDE GROUPS HAVE BEEN CONVERTED TO AMINO GROUPS.
Claim 2
Dependent Claim
33 words
A PHOTOGRAPHIC COLLOID SILVER HALIDE EMULSION IN WHICH THE COLLOID CONSISTS AT LEAST IN PART OF A POLYACRYLAMIDE IN WHICH 2 TO 20% OF THE AMIDE GROUPS HAVE BEEN CONVERTED TO AMINO GROUPS.
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |