US3307948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development accelerators
Assignee: Gevaert Photo Producten NV
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Filing: 1965-05-24
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Granted: 1967-03-07
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Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 Thiers Robrecht Julius
- 👤 Willems Jozef Frans
- 👤 Florens Raymond Leopold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/043; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/3275; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3825; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
PROCESS FOR DEVELOPING PHOTOGRAPHIC MATERIALS CONTAINING LIGHT-SENSITIVE SILVER HALIDE WHICH COMPRISES THE STEP OF DEVELOPING SAID MATERIALS IN THE PRESENCE OF A PHOTOGRAPHIC DEVELOPING AGENT AND OF A WATER-SOLUBLE COMPOUND FORMED BY CONDENSATION OF AT LEAST ONE MEMBER SELECTED FROM A DIALKANOLAMINE AND A DIALKANOLAMIDE WITH AN ORGANIC DIISOCYANATE AND A POLYOXYALKYLENE GLYCOL THE AMOUNT OF ORGANIC DIISOCYANATE TO SAID MEMBER BEING IN THE RANGE OF A MOLAR RATIO OF 1-2:1 AND THE AMOUNT OF SAID GLYCOL BEING SUFFICIENT TO IMPART WATER SOLUBILITY TO THE ULTIMATE CONDENSATION PRODUCT.
Claim 2
Dependent Claim
88 words
PROCESS FOR DEVELOPING PHOTOGRAPHIC MATERIALS CONTAINING LIGHT-SENSITIVE SILVER HALIDE WHICH COMPRISES THE STEP OF DEVELOPING SAID MATERIALS IN THE PRESENCE OF A PHOTOGRAPHIC DEVELOPING AGENT AND OF A WATER-SOLUBLE COMPOUND FORMED BY CONDENSATION OF AT LEAST ONE MEMBER SELECTED FROM A DIALKANOLAMINE AND A DIALKANOLAMIDE WITH AN ORGANIC DIISOCYANATE AND A POLYOXYALKYLENE GLYCOL THE AMOUNT OF ORGANIC DIISOCYANATE TO SAID MEMBER BEING IN THE RANGE OF A MOLAR RATIO OF 1-2:1 AND THE AMOUNT OF SAID GLYCOL BEING SUFFICIENT TO IMPART WATER SOLUBILITY TO THE ULTIMATE CONDENSATION PRODUCT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |