US3189449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colloid stratum transfer process
Assignee: Eastman Kodak Co
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Filing: 1962-10-01
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Granted: 1965-06-15
•
Expires: 1982-10-01
Abstract
No abstract record available.
Inventors
- 👤 Richard G Yost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:54
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES DEVELOPING AN EXPOSED, SUBSTANTIALLY NON-HARDENED, GELATINO-SILVER HALIDE EMULSION LAYER, SAID EMULSION BEING NOT HARDER THAN A GELATIN LAYER VONTINING 0.7 GRM OF FORMALDEHYDE PER POUND OF GELATIN FRESHLY COATED, WITH A SOLUTION OF TRIPOTASSIUM PHOSPHATE AND POTASSIUM SLICYLATE IN THE PRESENCE OF BOTH A GELATIN TANNING SILVER HALIDE DEVELOPING AGENT AND A SUBSTANTIALLY NON-TANNING SILVER HALIDE EVELOPING AGENT TO OBTAIN A HARDENED GELATIN AND SILVER IMAGE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE HIGHLIGHTS OF THE SUBJECT, AND SUBSTANTIALLY UNHARDENED GELATIN, SILVER, AND SILVER HALIDE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE SHADOWS OF THE SUBJECT, SAID DEVELOPMENT BEING SUCH AS TO PREVENT ANY SUBSTANTIAL TANNING OF THE EMULSION LAYER IN SAID AREAS CORRESPONDING TO THE SHADOWS OF THE SUBJECT, PRESSING A SHEET HAVING AN ABSORBENT SURFACE AGAINST SAID EMULSION LAYER WHILE SAID EMULSION LAYER IS MOIST TO CAUSE ONLY THE SHADOW AREAS OF THE EMULSION TO ADHERE TO THE SHEET, AND SEPARATING SAID SHEET AND EMULSION TO ADHERE TO THE SHEET, AND SEPARATING SAID SHEET AND EMULSION LAYER TO TRANSFER ONLY A STRATUM OF SAID SHADOW AREAS OF THE EMULSION LAYER TO SAID SHEET.
Claim 2
Independent Claim
198 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES DEVELOPING AN EXPOSED, SUBSTANTIALLY NON-HARDENED, GELATINO-SILVER HALIDE EMULSION LAYER, SAID EMULSION BEING NOT HARDER THAN A GELATIN LAYER VONTINING 0.7 GRM OF FORMALDEHYDE PER POUND OF GELATIN FRESHLY COATED, WITH A SOLUTION OF TRIPOTASSIUM PHOSPHATE AND POTASSIUM SLICYLATE IN THE PRESENCE OF BOTH A GELATIN TANNING SILVER HALIDE DEVELOPING AGENT AND A SUBSTANTIALLY NON-TANNING SILVER HALIDE EVELOPING AGENT TO OBTAIN A HARDENED GELATIN AND SILVER IMAGE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE HIGHLIGHTS OF THE SUBJECT, AND SUBSTANTIALLY UNHARDENED GELATIN, SILVER, AND SILVER HALIDE IN THE AREAS OF THE EMULSION LAYER CORRESPONDING TO THE SHADOWS OF THE SUBJECT, SAID DEVELOPMENT BEING SUCH AS TO PREVENT ANY SUBSTANTIAL TANNING OF THE EMULSION LAYER IN SAID AREAS CORRESPONDING TO THE SHADOWS OF THE SUBJECT, PRESSING A SHEET HAVING AN ABSORBENT SURFACE AGAINST SAID EMULSION LAYER WHILE SAID EMULSION LAYER IS MOIST TO CAUSE ONLY THE SHADOW AREAS OF THE EMULSION TO ADHERE TO THE SHEET, AND SEPARATING SAID SHEET AND EMULSION TO ADHERE TO THE SHEET, AND SEPARATING SAID SHEET AND EMULSION LAYER TO TRANSFER ONLY A STRATUM OF SAID SHADOW AREAS OF THE EMULSION LAYER TO SAID SHEET.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |