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US4997749A Expired / Lapsed US ⏱️ 0.0 years remaining

Overflow-free color photographic development system

Assignee: Agfa Gevaert AG
•
Filing: 1988-12-27
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Granted: 1991-03-05
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Expires: 2008-12-27
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Abstract

Abstract True-to-type development without any overflow is achieved with a developer solution system of a refill solution and--replenished therewith--a ready-to-use developer solution which contains the following constituents in the quantities indicated per liter aqueous solution and, optionally, other typical consituents: 3-15 g of the following color developer compound ##STR1## or a corresponding quantity of salts thereof, 8-35 g PO 4 3 ions, at least 0.2 g antioxidant and 2.1-4.2 g KBr and which is adjusted to a pH value of 10.5 to 12.5, the regeneration quota amounting to between 50 and 120 ml/m 2 developed material and the refill solution containing the individual constituents in a such a concentration that, for the above-mentioned regeneration quota, the in-use developer solution always contains the constituents shown above in the quantities indicated.

Inventors

  • 👤 Ubbo Wernicke
  • 👤 Herbert Mitzinger

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 14:36
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 149 words
A negative working developer solution system consisting essentially of a refill solution and a ready-to-use developer solution replenished therewith for color negative paper, wherein said ready-to-use developer solution contains the following constituents in the quantities indicated per liter aqueous solution 0-20 g benzyl alcohol 3-15 g of the following color developer compound ##STR4## or a corresponding quantity of salts thereof, - 2g of the following color developer compound ##STR5## or a corresponding quantity of salts thereof, - 35g PO 4 3 ions, at least 0.2 g antioxidant and 2.1-4.2 g KBr and is adjusted to a pH value of from 10.5 to 12.5, in that the regeneration quota amounts to between 50 and 120 ml/m 2 developed material and the refill solution contains the individual constituents in such a concentration that, for the regeneration quota shown, the in-use developer solution always contains the above-mentioned constituents in the quantities indicated.
Claim 2
Dependent Claim 149 words
A negative working developer solution system consisting essentially of a refill solution and a ready-to-use developer solution replenished therewith for color negative paper, wherein said ready-to-use developer solution contains the following constituents in the quantities indicated per liter aqueous solution 0-20 g benzyl alcohol 3-15 g of the following color developer compound ##STR4## or a corresponding quantity of salts thereof, - 2g of the following color developer compound ##STR5## or a corresponding quantity of salts thereof, - 35g PO 4 3 ions, at least 0.2 g antioxidant and 2.1-4.2 g KBr and is adjusted to a pH value of from 10.5 to 12.5, in that the regeneration quota amounts to between 50 and 120 ml/m 2 developed material and the refill solution contains the individual constituents in such a concentration that, for the regeneration quota shown, the in-use developer solution always contains the above-mentioned constituents in the quantities indicated.
Claim 3
Dependent Claim 27 words
A developer solution system as claimed in claim 1, characterized in that the ratio by weight of developer substances (based on free base) to KBr is <4.

References Cited (Backward Citations)

US3986877A Cited
US4161406A Cited
EP0173203A2 Cited
US4756997A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-03-04 1994-09-03 1995-03-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-03-04 1998-09-03 1999-03-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-03-04 2002-09-03 2003-03-05 $7700.00 Window Closed / Lapsed

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