Patent US1642952A successfully refreshed from Google Patents.
Patent US2666700A successfully refreshed from Google Patents.
US2666700A
Expired / Lapsed
US
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Process of preparing a light sensitive silver halide emulsion
Assignee: EIDP Inc
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Filing: 1950-09-06
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Granted: 1954-01-19
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Expires: 1970-09-06
Abstract
No abstract record available.
Inventors
- 👤 Baldsiefen Walter Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:39
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN A PROCESS OF PREPARING A LIGHT-SENSITIVE, WATER-PERMEABLE COLLOID-SILVER HALID EMULSION INCLUDING PRECIPITATION, RIPENING, WASHING AND DIGESTION PERIODS THE STEP WHICH COMPRISES ADDING TO THE DISPERSION OF PRECIPITATED SILVER HALIDES IN THE COLLOID PRIOR TO CONCLUSION OF THE DIGESTION PERIOD, FROM 0.097% TO 0.91% BY WEIGHT BASED ON THE SILVER OF A COMPOUND TAKEN FROM THE CLASS CONSISTING OF TETRACARBOXYMETHYLETHYLENEDIAMINE AND ITS ALKALI METAL, AMMONIUM, TETRAMETHYLAMMONIUM, TETRAETHYLAMMONIUM, AND AMINE SALTS.
Claim 2
Dependent Claim
70 words
IN A PROCESS OF PREPARING A LIGHT-SENSITIVE, WATER-PERMEABLE COLLOID-SILVER HALID EMULSION INCLUDING PRECIPITATION, RIPENING, WASHING AND DIGESTION PERIODS THE STEP WHICH COMPRISES ADDING TO THE DISPERSION OF PRECIPITATED SILVER HALIDES IN THE COLLOID PRIOR TO CONCLUSION OF THE DIGESTION PERIOD, FROM 0.097% TO 0.91% BY WEIGHT BASED ON THE SILVER OF A COMPOUND TAKEN FROM THE CLASS CONSISTING OF TETRACARBOXYMETHYLETHYLENEDIAMINE AND ITS ALKALI METAL, AMMONIUM, TETRAMETHYLAMMONIUM, TETRAETHYLAMMONIUM, AND AMINE SALTS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |