US3575993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain phenacyl pyridinium compounds
Assignee: Eastman Kodak Co
•
Filing: 1968-08-09
•
Granted: 1971-04-20
•
Expires: 1988-08-09
Abstract
Abstract A BULKY QUATERNARY NITROGEN HETEROCYCLIC ALKALI-RELEASE MORDANT THAT UNDER ALKALINE CONDITIONS FORM A BETAINE THAT WILL NOT MORDANT ANIONS, IS ADVANTEGEOUSLY USED AS A MORDANT FOR A WATER-SOLUBLE ACID DYE AND HYDROPHILIC COLLOID LIGHT-ABSORBING AND LIGHT-FILTERING LAYERS OF PHOTOGRPAHIC ELEMENTS WHERE IT IS DESIRED TO FIRMLY HOLD THE ACID DYE UNTIL PHOTOGRAPHIC PROCESSING WHEN DURING TREATMENT IN THE ALKALINE PROCESSING SOLUTIONS THE ACID DYE IS COMPLETELY RELEASED AND THE BETAINE FORMED OF THE MORDANT IS INCAPABLE OF REMORDANTING THE ACID DYE OR THIO-SULFATE IONS FROM THE FIXING BATH.
Inventors
- 👤 Donald W Heseltine
- 👤 Dugald A Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:46
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/28; C07D213/30; C07D213/06; C07D213/16; C07D213/20; C07D215/00; C07D215/02; C07D215/04; C07D215/10; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D257/00; C07D257/02; C07D257/04; C07D293/00; C07D293/02; C07D293/04; C07D293/06; G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/835
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |