Patent US2728664A successfully refreshed from Google Patents.
US2728664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions containing mercury salts
Assignee: Eastman Kodak Co
•
Filing: 1952-11-08
•
Granted: 1955-12-27
•
Expires: 1972-11-08
Abstract
No abstract record available.
Inventors
- 👤 Burt H Carroll
- 👤 Thomas F Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A SILVER HALIDE EMULSION SUBSTANTIALLY FREE FROM INCREASE IN FOG AND LOSS OF SPEED UPON STORAGE, CONTAINING AS THE ONLY HEAVY METAL SALT OTHER THAN SILVER HALIDE, AN APPRECIABLE AND FOG-INHIBITING AMOUNT, BUT NOT MORE THAN ABOUT 0.25 MG. PER MOLE OF SILVER HALIDE IN THE EMULSION, OF A MERCURY SALT SELECTED FROM THE CLASS CONSISTING OF MERCURIC CHLORIDE, MERCUROUS CHLORIDE, MERCURIC BROMIDE, MERCUROUS BROMIDE, MERCUROUS IODIDE, MERCUROUS IODIDE, MERCURIC NITRATE, MERCUROUS NITRATE, MERCUROUS SULFATE, MERCURIC ACETATE, K3HG(CN)4 AND K2HGBR4.
Claim 2
Dependent Claim
80 words
A SILVER HALIDE EMULSION SUBSTANTIALLY FREE FROM INCREASE IN FOG AND LOSS OF SPEED UPON STORAGE, CONTAINING AS THE ONLY HEAVY METAL SALT OTHER THAN SILVER HALIDE, AN APPRECIABLE AND FOG-INHIBITING AMOUNT, BUT NOT MORE THAN ABOUT 0.25 MG. PER MOLE OF SILVER HALIDE IN THE EMULSION, OF A MERCURY SALT SELECTED FROM THE CLASS CONSISTING OF MERCURIC CHLORIDE, MERCUROUS CHLORIDE, MERCURIC BROMIDE, MERCUROUS BROMIDE, MERCUROUS IODIDE, MERCUROUS IODIDE, MERCURIC NITRATE, MERCUROUS NITRATE, MERCUROUS SULFATE, MERCURIC ACETATE, K3HG(CN)4 AND K2HGBR4.
References Cited (Backward Citations)
US2540086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |