US2544910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tone control in photography
Assignee: Eastman Kodak Co
•
Filing: 1947-10-09
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Granted: 1951-03-13
•
Expires: 1967-10-09
Abstract
No abstract record available.
Inventors
- 👤 John A C Yule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:41
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
THE METHOD OF MAKING A NEGATIVE PHOTOGRAPHIC IMAGE HAVING INCREASED SHADOW AND HIGHLIGHT CONTRAST WHICH COMPRISES EXPOSING TO AN IMAGE A SILVER HALIDE EMULSION LAYER GIVING A CONTRAST OF FROM 3 TO 15 WHEN DEVELOPED TO LESS THAN ONE-FIFTH ITS MAXIMUM SPEED IN A DEVELOPER HAVING THE COMPOSITION:
Claim 2
Independent Claim
48 words
THE METHOD OF MAKING A NEGATIVE PHOTOGRAPHIC IMAGE HAVING INCREASED SHADOW AND HIGHLIGHT CONTRAST WHICH COMPRISES EXPOSING TO AN IMAGE A SILVER HALIDE EMULSION LAYER GIVING A CONTRAST OF FROM 3 TO 15 WHEN DEVELOPED TO LESS THAN ONE-FIFTH ITS MAXIMUM SPEED IN A DEVELOPER HAVING THE COMPOSITION:
References Cited (Backward Citations)
US1973466A
Cited
US1954335A
Cited
US2186054A
Cited
US2173739A
Cited
US2258187A
Cited
US2253070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |