US2675313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic reproduction process
Assignee: Eastman Kodak Co
•
Filing: 1952-01-21
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Granted: 1954-04-13
•
Expires: 1972-01-21
Abstract
No abstract record available.
Inventors
- 👤 Henry C Yutzy
- 👤 Edward C Yackel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:49
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03B; G03B15/00; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315; Y; Y10; Y10S; Y10S101/00; Y10S101/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES EXPOSING TO A TWO-TONE SUBJECT A SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING A GELATIN TANNING SILVER HALIDE DEVELOPING AGENT, SAID EMULSION BEING NOT HARDER THAN A GELATIN LAYER CONTAINING 0.7 GRAM OF FORMALDEHYDE PER POUND OF GELATIN FRESHLY COATED, DEVELOPING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION TO OBTAIN A HARDENED GELATIN AND SILVER IMAGE IN THE REGION OF EXPOSURE AND SUBSTANTIALLY UNHARDENED GELATIN AND SILVER HALIDE IN THE UNEXPOSED REGION OF THE EMULSION LAYER, TREATING THE DEVELOPED EMULSION LAYER WITH AN AQUEOUS ALKALINE SOLUTION OF AN ALKALI METAL SULFITE TO RETARD HARDENING OF THE EMULSION IN THE UNEXPOSED REGION, FOGGING SAID UNEXPOSED EMULSION REGION AT SOME STAGE NOT EARLIER THAN SAID TREATING STEP, TO INITIATE DEVELOPMENT, PRESSING A SHEET HAVING AN ABSORBENT SURFACE AGAINST SAID EMULSION LAYER WHILE THE LAYER IS MOIST TO CAUSE ONLY THE SAID UNEXPOSED REGION OF EMULSION TO ADHERE TO SAID SHEET, AND SEPARATING SAID SHEET AND EMULSION LAYER TO TRANSFER ONLY A STRATUM OF THE UNEXPOSED REGION OF THE EMULSION LAYER CONTAINING SILVER TO SAID SHEET.
Claim 2
Independent Claim
181 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES EXPOSING TO A TWO-TONE SUBJECT A SUBSTANTIALLY UNHARDENED GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING A GELATIN TANNING SILVER HALIDE DEVELOPING AGENT, SAID EMULSION BEING NOT HARDER THAN A GELATIN LAYER CONTAINING 0.7 GRAM OF FORMALDEHYDE PER POUND OF GELATIN FRESHLY COATED, DEVELOPING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION TO OBTAIN A HARDENED GELATIN AND SILVER IMAGE IN THE REGION OF EXPOSURE AND SUBSTANTIALLY UNHARDENED GELATIN AND SILVER HALIDE IN THE UNEXPOSED REGION OF THE EMULSION LAYER, TREATING THE DEVELOPED EMULSION LAYER WITH AN AQUEOUS ALKALINE SOLUTION OF AN ALKALI METAL SULFITE TO RETARD HARDENING OF THE EMULSION IN THE UNEXPOSED REGION, FOGGING SAID UNEXPOSED EMULSION REGION AT SOME STAGE NOT EARLIER THAN SAID TREATING STEP, TO INITIATE DEVELOPMENT, PRESSING A SHEET HAVING AN ABSORBENT SURFACE AGAINST SAID EMULSION LAYER WHILE THE LAYER IS MOIST TO CAUSE ONLY THE SAID UNEXPOSED REGION OF EMULSION TO ADHERE TO SAID SHEET, AND SEPARATING SAID SHEET AND EMULSION LAYER TO TRANSFER ONLY A STRATUM OF THE UNEXPOSED REGION OF THE EMULSION LAYER CONTAINING SILVER TO SAID SHEET.
References Cited (Backward Citations)
GB204101A
Cited
US2596756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |