Patent US3189448A successfully refreshed from Google Patents.
US3189448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing compositions used in photographic transfer processes
Assignee: Eastman Kodak Co
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Filing: 1962-08-22
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Granted: 1965-06-15
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Expires: 1982-08-22
Abstract
No abstract record available.
Inventors
- 👤 Frederic R Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:21
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/262
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
A COMPOSITION USEFUL IN DEVELOPING LAYERS OF UNHARDENED GELATIN-SILVER HALIDE EMULSIONS IN A PHOTOGRAPHIC TRANSFER OF AN ALKALI METAL SLAT OF AN AROMATIC SULFONIC ACID CONTAINING 6-8 CARBON ATOMS PER MOLECULE, A POLY ETHYLENE GLYCOL CONTAINING UP TO 6 CARBON ATOMS PER MOLECULE AND SUFFICIENT ALKALINE MATERIAL TO IMPART A PH OF 10.5-12.5 TO THE SOLUTION.
Claim 2
Dependent Claim
56 words
A COMPOSITION USEFUL IN DEVELOPING LAYERS OF UNHARDENED GELATIN-SILVER HALIDE EMULSIONS IN A PHOTOGRAPHIC TRANSFER OF AN ALKALI METAL SLAT OF AN AROMATIC SULFONIC ACID CONTAINING 6-8 CARBON ATOMS PER MOLECULE, A POLY ETHYLENE GLYCOL CONTAINING UP TO 6 CARBON ATOMS PER MOLECULE AND SUFFICIENT ALKALINE MATERIAL TO IMPART A PH OF 10.5-12.5 TO THE SOLUTION.
Claim 3
Independent Claim
145 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES EXPOSING AN UNHARDENED GELATIN-SILVER HALIDE PHOTOSENSITIVE EMULSION LAYER TO A TWO-TONE SUBJECT, DEVELOPING IN THE PRESENCE OF A TANNING DEVELOPMENT AGENT AND TREATING WITH A COMPOSITION ESSENTIALLY CONSISTING OF AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF PARATOLUENE SULFONIC ACID, A POLYETHYLENE GLYCOL CONTAINING UP TO 6 CARBON ATOMS PER MOLECULE AND SUFFICIENT ALKALINE MATERIAL TO IMPART A PH OF 10.5-12.5 TO THE SOLUTION, THEREBY GIVING A HARDENED COLLOID IMAGE AND LEAVING SUBSTANTIALLY UNHARDENED COLLOIID IN THE REMAINING AREA OF THE EMULSION LAYER, PRESSING THE EMULSION LAYER WHILE MOIS T AGAINST A SHEET HAVING AN ABSORBENT SURFACE TO CAUSE ONLY SAID UNHARDENED COLLOID PORTION OF THE LAYER TO ADHERE TO SAID SHEET AND SEPARATING SAID SHEET AND SAID EMULSION LAYER WHEREBY ONLY A STRATUM OF THE UNHARDENED COLLOID PORTION OF SAID LAYER IS TRANSFERRED TO SAID SHEET.
Claim 4
Independent Claim
145 words
A METHOD OF PHOTOGRAPHIC REPRODUCTION WHICH COMPRISES EXPOSING AN UNHARDENED GELATIN-SILVER HALIDE PHOTOSENSITIVE EMULSION LAYER TO A TWO-TONE SUBJECT, DEVELOPING IN THE PRESENCE OF A TANNING DEVELOPMENT AGENT AND TREATING WITH A COMPOSITION ESSENTIALLY CONSISTING OF AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF PARATOLUENE SULFONIC ACID, A POLYETHYLENE GLYCOL CONTAINING UP TO 6 CARBON ATOMS PER MOLECULE AND SUFFICIENT ALKALINE MATERIAL TO IMPART A PH OF 10.5-12.5 TO THE SOLUTION, THEREBY GIVING A HARDENED COLLOID IMAGE AND LEAVING SUBSTANTIALLY UNHARDENED COLLOIID IN THE REMAINING AREA OF THE EMULSION LAYER, PRESSING THE EMULSION LAYER WHILE MOIS T AGAINST A SHEET HAVING AN ABSORBENT SURFACE TO CAUSE ONLY SAID UNHARDENED COLLOID PORTION OF THE LAYER TO ADHERE TO SAID SHEET AND SEPARATING SAID SHEET AND SAID EMULSION LAYER WHEREBY ONLY A STRATUM OF THE UNHARDENED COLLOID PORTION OF SAID LAYER IS TRANSFERRED TO SAID SHEET.
References Cited (Backward Citations)
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US2716059A
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US2834676A
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US3017271A
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US3042521A
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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 |