US3589902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer concentrate
Assignee: Agfa Gevaert AG
•
Filing: 1966-12-13
•
Granted: 1971-06-29
•
Expires: 1986-12-13
Abstract
Abstract DEVELOPER CONCENTRATES HAVING ADDED COPOLYMER OF POLYETHYLENE GLYCOL WITH AN OLEFINICALLY UNSATURATED CARBOXYLIC OR SULFONIC ACID OR ADDED COPOLYMER OF A POLYETHYLENE GLYCOL ESTER OF AN UNSATURATED CARBOXYLIC ACID WITH A VINYL COMPOUND CONTAINING A CARBOXYLIC OR SULFONIC ACID GROUP. SUCH COPOLYMERS COMPENSATE FOR THE CONTRAST LOSS OTHERWISE PRODUCED BY A DEVELOPER MADE BY DILUTING AN AQUEOUS-ORGANIC SOLUTION OF THE DEVELOPER CONCENTRATE.
Inventors
- 👤 Wolfgang Himmelmann
- 👤 Helmut Mader
- 👤 Heinz Sassmann
- 👤 Hans Schellenberger
- 👤 Karl-Otto Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:52
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/266; C; C08; C08F; C08F290/00; C08F290/02; C08F290/06; C08F290/062; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/331; C08G65/332; C08L; C08L71/00; C08L71/02
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |