US2540085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsions
Assignee: EIDP Inc
•
Filing: 1948-05-19
•
Granted: 1951-02-06
•
Expires: 1968-05-19
Abstract
No abstract record available.
Inventors
- 👤 Baldsiefen Walter Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A COLLOID SILVER HALIDE EMULSION CONTAINING WATER-SOLUBLE GOLD AND IRON SALTS IN SUCH PROPORTIONS THAT THE EMULSION CONTAINS .0000723 TO .000288 MOL PER CENT OF GOLD AND .0002165 TO .0110 MOL PER CENT OF IRON, BASED ON THE SILVER CONTENT OF SUCH EMULSION.
Claim 2
Dependent Claim
43 words
A COLLOID SILVER HALIDE EMULSION CONTAINING WATER-SOLUBLE GOLD AND IRON SALTS IN SUCH PROPORTIONS THAT THE EMULSION CONTAINS .0000723 TO .000288 MOL PER CENT OF GOLD AND .0002165 TO .0110 MOL PER CENT OF IRON, BASED ON THE SILVER CONTENT OF SUCH EMULSION.
References Cited (Backward Citations)
US2059642A
Cited
US2399083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |