| (19) |
 |
|
(11) |
EP 0 585 792 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
10.08.1994 Bulletin 1994/32 |
| (43) |
Date of publication A2: |
|
09.03.1994 Bulletin 1994/10 |
| (22) |
Date of filing: 25.08.1993 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT |
| (30) |
Priority: |
04.09.1992 US 941343
|
| (71) |
Applicant: E.I. DU PONT DE NEMOURS AND COMPANY |
|
Wilmington
Delaware 19898 (US) |
|
| (72) |
Inventors: |
|
- Passarella, Rose
Rochester,
New York 14622 (US)
- Juers, Daniel Frederick
Fairport,
New York 14450 (US)
- Oertel, Paul Leonard, Jr.
Pittsford,
New York 14534 (US)
|
| (74) |
Representative: von Kreisler, Alek, Dipl.-Chem. |
|
Patentanwälte
von Kreisler-Selting-Werner
Postfach 10 22 41
50462 Köln
50462 Köln (DE) |
|
| |
|
| (54) |
Process of recycling spent photographic developer and recycled photographic developer |
(57) A process for recycling a hydroquinone-free black-and-white photographic developer
composition comprises the steps of collecting the developer, optionally filtering
the collected material, and reconstituting the developer, whereby the spent developer
is brought back to substantially the activity of fresh developer having the same composition
wherein the recycled developer can be used to process black-and-white photographic
materials without adverse effects.