US3436222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a photographic emulsion
Assignee: 3M Co
•
Filing: 1965-02-26
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Granted: 1969-04-01
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Expires: 1985-02-26
Abstract
No abstract record available.
Inventors
- 👤 Ramsis Gobran
- 👤 Ronald F Ofstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD FOR PREPARING A PHOTOGRAPHIC EMULSIONL CONTAINING SILVER HALIDE CRYSTALS WHICH COMPRISES PREPARING AN AQUEOUS SOLUTION OF A HALIDE SALT OF A POLYMERIC POLYAMINE HAVING A MOLECULAR WEIGHT GREATER THAN ABOUT 1000 AND CONTAINING ABOUT 3 TO 50 PERCENT BY WEIGHT OF AMINO NITROGEN, AND ADDING THERETO AN AQUEOUS SOLUTION OF A SOLUBLE SILVER SALT.
Claim 2
Independent Claim
56 words
A METHOD FOR PREPARING A PHOTOGRAPHIC EMULSIONL CONTAINING SILVER HALIDE CRYSTALS WHICH COMPRISES PREPARING AN AQUEOUS SOLUTION OF A HALIDE SALT OF A POLYMERIC POLYAMINE HAVING A MOLECULAR WEIGHT GREATER THAN ABOUT 1000 AND CONTAINING ABOUT 3 TO 50 PERCENT BY WEIGHT OF AMINO NITROGEN, AND ADDING THERETO AN AQUEOUS SOLUTION OF A SOLUBLE SILVER SALT.
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) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |