Patent US2839401A successfully refreshed from Google Patents.
US2839401A
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Photographic silver halide emulsions containing copolymeric mordants
Assignee: EIDP Inc
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Filing: 1954-12-29
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Granted: 1958-06-17
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Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 Gray Russell Houston
- 👤 Webers Vincent Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:28
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/22; G03C7/25; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/34; C08F28/00; G03C1/00; G03C1/76; G03C1/825; G03C1/835; Y; Y10; Y10S; Y10S430/00; Y10S430/142; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
APHOTOGRAPHIC SILVER HALIDE EMULSION IN A WATERPERMAEBLE COLLOID CONTAINING IN MORDANTING AMOUNTS A LINEAR ADDITION COPOLYMER CONSISTING ESSENTIALLY OF INTRALINEAR QUATERNARY AMMONIUM AND TERTIARY AMINE SALT UNITS OF TH FORMULAE:
Claim 2
Dependent Claim
30 words
APHOTOGRAPHIC SILVER HALIDE EMULSION IN A WATERPERMAEBLE COLLOID CONTAINING IN MORDANTING AMOUNTS A LINEAR ADDITION COPOLYMER CONSISTING ESSENTIALLY OF INTRALINEAR QUATERNARY AMMONIUM AND TERTIARY AMINE SALT UNITS OF TH FORMULAE:
References Cited (Backward Citations)
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Cited
US2539706A
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US2495918A
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US2566250A
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US2600446A
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US2678884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |