US3087818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions, elements, and processes
Assignee: EIDP Inc
•
Filing: 1961-01-16
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Granted: 1963-04-30
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Expires: 1981-01-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Vaughan Crandall Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION HAVING INCREASED COVERING POWER OF DEVELOPED SILVER COMPRISING ON A DRY BASIS PER 100 PARTS BY WEIGHT OF GELATIN, 20 TO 80 PARTS BY WEIGHT OF AT LEAST ONE WATER-SOLUBLE PECTIC POLYSACCHARIDE TAKEN FROM THE GROUP CONSISTING OF ARABAN, ARABOGALACTAN AND GALACTAN HAVING A MOLECULAR WEIGHT OF 6,000 TO 100,000, AND 60 TO 150 PARTS BY WEIGHT OF A LIGHT-SENSITIVE SILVER HALIDE.
Claim 2
Dependent Claim
67 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION HAVING INCREASED COVERING POWER OF DEVELOPED SILVER COMPRISING ON A DRY BASIS PER 100 PARTS BY WEIGHT OF GELATIN, 20 TO 80 PARTS BY WEIGHT OF AT LEAST ONE WATER-SOLUBLE PECTIC POLYSACCHARIDE TAKEN FROM THE GROUP CONSISTING OF ARABAN, ARABOGALACTAN AND GALACTAN HAVING A MOLECULAR WEIGHT OF 6,000 TO 100,000, AND 60 TO 150 PARTS BY WEIGHT OF A LIGHT-SENSITIVE SILVER HALIDE.
References Cited (Backward Citations)
US2441440A
Cited
US3003878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |