Patent US4948232A successfully refreshed from Google Patents.
Patent US2984568A successfully refreshed from Google Patents.
US2984568A
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Photographic antihalation and protective layer comprising a nitrated styrene-maleic acid copolymer
Assignee: Gevaert Photo Producten NV
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Filing: 1957-11-26
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Granted: 1961-05-16
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Expires: 1977-11-26
Abstract
No abstract record available.
Inventors
- 👤 Hart Rene Maurice
- 👤 Roosens Laurent Pierre
- 👤 Troquet Jacques Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:25
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/835; C; C08; C08F; C08F8/00; C08F8/30; G03C1/7614; C08F2800/00; C08F2800/20; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT, AT LEAST ONE LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER, AND AN ALKALI-SOLUBLE HYDROPHOBIC OUTER LAYER, SAID OUTER LAYER BEING MAINLY CONSTITUTED BY A NITRATED COPOLYMER CONSISTING OF 50 MOL PERCENT STYRENE MONOMERIC UNITS ALTERNATING WITH 50 MOL PERCENT MALEIC ACID MONOMERIC UNITS, THE COPOLYMER CONTAINING 0.8 TO 1.2 NITRO GROUPS PER STYRENE MONOMERIC UNIT.
Claim 2
Dependent Claim
59 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT, AT LEAST ONE LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER, AND AN ALKALI-SOLUBLE HYDROPHOBIC OUTER LAYER, SAID OUTER LAYER BEING MAINLY CONSTITUTED BY A NITRATED COPOLYMER CONSISTING OF 50 MOL PERCENT STYRENE MONOMERIC UNITS ALTERNATING WITH 50 MOL PERCENT MALEIC ACID MONOMERIC UNITS, THE COPOLYMER CONTAINING 0.8 TO 1.2 NITRO GROUPS PER STYRENE MONOMERIC UNIT.
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) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |