US2856283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsion
Assignee: Eastman Kodak Co
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Filing: 1956-05-07
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Granted: 1958-10-14
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Expires: 1976-05-07
Abstract
No abstract record available.
Inventors
- 👤 Edward C Yackel
- 👤 Thomas I Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:38
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
A SILVER HALIDE EMULSION CONTAINING A MIXTURE OF GELATION, A SILVER HALIDE DEVELOPING AGENT, AND ABOUT 0.5 TO 3 PARTS OF A WATER-SOLUBLE WAX PER PART OF GELATIN.
Claim 2
Dependent Claim
28 words
A SILVER HALIDE EMULSION CONTAINING A MIXTURE OF GELATION, A SILVER HALIDE DEVELOPING AGENT, AND ABOUT 0.5 TO 3 PARTS OF A WATER-SOLUBLE WAX PER PART OF GELATIN.
Claim 3
Independent Claim
206 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES EXPOSING TO A TWO-TONE SUBJECT A SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING A MIXTURE OF ABOUT 0.5 PART OF A WATER-INSOLUBLE WAX PER PART OF GELATIN AND A DEVELOPING AGENT OF THE CLASS CONSISTING OF 3,4-DIHYDROXY DIPHENYL, 2,5-DIHYDROXY DIPHENYL, 2,3-DIHYDROXY DIPHENYL, 4-PHENOXY CATECHOL, 4(2,4-DI-TERT. AMYL) PHENOXY CATECHOL AND 1,2-DIETHOXALYL4-PHENOXY CATECHOL, SO AS TO OBTAIN SOME EXPOSURE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE SHADOW AREAS OF THE SUBJECT AND APPRECIABLY MORE EXPOSURE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE HIGHLIGHT AREAS OF THE SUBJECT, DEVELOPING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION TO OBTAIN A HARDENED GELATIN, WAX AND SILVER IMAGE IN THE REGION OF EXPOSURE TO THE HIGHLIGHT AREA OF THE SUBJECT AND SUBSTANTIALLY UNHARDENED GELATIN, WAX, SILVER AND SILVER HALIDE IN THE REGION OF THE EMULSION LAYER CORRESPONDING TO THE SHADOW REGION OF THE SUBJECT, PRESSING A SHEET HAVING AN ABSORBENT SURFACE AGAINST SAID ENMULSION LAYER WHILE SAID EMULSION LAYER IS MOIST TO CAUSE ONLY THE SHADOW REGION OF THE EMULSION TO ADHERE TO SAID SHEET, AND SEPARATING SAID SHEET AND EMULSION LAYER TO TRANSFER ONLY A STRATUM OF SAID SHADOW REGION OF THE EMULSION LAYER TO SAID SHEET.
Claim 4
Independent Claim
206 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES EXPOSING TO A TWO-TONE SUBJECT A SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING A MIXTURE OF ABOUT 0.5 PART OF A WATER-INSOLUBLE WAX PER PART OF GELATIN AND A DEVELOPING AGENT OF THE CLASS CONSISTING OF 3,4-DIHYDROXY DIPHENYL, 2,5-DIHYDROXY DIPHENYL, 2,3-DIHYDROXY DIPHENYL, 4-PHENOXY CATECHOL, 4(2,4-DI-TERT. AMYL) PHENOXY CATECHOL AND 1,2-DIETHOXALYL4-PHENOXY CATECHOL, SO AS TO OBTAIN SOME EXPOSURE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE SHADOW AREAS OF THE SUBJECT AND APPRECIABLY MORE EXPOSURE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE HIGHLIGHT AREAS OF THE SUBJECT, DEVELOPING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION TO OBTAIN A HARDENED GELATIN, WAX AND SILVER IMAGE IN THE REGION OF EXPOSURE TO THE HIGHLIGHT AREA OF THE SUBJECT AND SUBSTANTIALLY UNHARDENED GELATIN, WAX, SILVER AND SILVER HALIDE IN THE REGION OF THE EMULSION LAYER CORRESPONDING TO THE SHADOW REGION OF THE SUBJECT, PRESSING A SHEET HAVING AN ABSORBENT SURFACE AGAINST SAID ENMULSION LAYER WHILE SAID EMULSION LAYER IS MOIST TO CAUSE ONLY THE SHADOW REGION OF THE EMULSION TO ADHERE TO SAID SHEET, AND SEPARATING SAID SHEET AND EMULSION LAYER TO TRANSFER ONLY A STRATUM OF SAID SHADOW REGION OF THE EMULSION LAYER TO SAID SHEET.
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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |