Patent US2622980A successfully refreshed from Google Patents.
US2622980A
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Photographic filter and antihalation layers containing 3-(benzylidene)-sulfo-oxindoles
Assignee: GAF Chemicals Corp
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Filing: 1950-11-18
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Granted: 1952-12-23
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Expires: 1970-11-18
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Copeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:02
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; C; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/30; C07D209/32; C07D209/34; G03B; G03B13/00; G03B13/18; G03B13/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A LIGHT SENSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A BASE AND A SILVER HALIDE EMULSION CARRIED THEREBY, SAID ELEMENT HAVING A FILTER LAYER CONTAINING A DISPERSION OF A SULFONATED OXINDOLE DYE OF THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
34 words
A LIGHT SENSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A BASE AND A SILVER HALIDE EMULSION CARRIED THEREBY, SAID ELEMENT HAVING A FILTER LAYER CONTAINING A DISPERSION OF A SULFONATED OXINDOLE DYE OF THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2390707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |