US6066441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of radiographic materials having emulsion grains rich in silver chloride
Assignee: Agfa Gevaert NV
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Filing: 1999-05-03
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Granted: 2000-05-23
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Expires: 2019-05-03
Abstract
Abstract A method is disclosed of processing an exposed black-and-white light-sensitive silver halide photographic material having silver halide, coated in an amount, expressed as an equivalent amount of silver nitrate of less than 6 g/m2 comprising the steps of developing, fixing, rinsing and drying, making use in the developing step of an ascorbic acid type developer and of an equivalent developer replenisher providing a regeneration amount of less than 150 ml/m2, characterized in that the said material has a buffering capacity of less than 6 mmole/m2, wherein said buffering capacity is defined as the amount of alkali, expressed in mmole/square meter, required to bridge across pH differences between the material and the developer.
Inventors
- 👤 Benedictus Jansen
- 👤 Freddy Henderickx
- 👤 Ann Verbeeck
- 👤 Frank Michiels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:59
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/04; C03C1/06; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/0051; G03C1/0053; G03C1/035; G03C1/08; G03C1/09; G03C2001/03517; G03C2001/03541; G03C2001/091; G03C2001/095; G03C2001/096; G03C2001/097; G03C5/00; G03C5/16; G03C2005/168; G03C5/26; G03C5/29; G03C5/30; G03C2005/3007; G03C7/00; G03C7/30; G03C7/3022; G03C2007/3025; G03C2200/00; G03C2200/01; G03C2200/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
Method of processing an exposed black-and-white light-sensitive silver halide photographic material having silver halide, coated in an amount, expressed as an equivalent amount of silver nitrate of less than 6 g/m 2 , said method comprising the steps of developing, fixing, rinsing and drying, making use in the developing step of an ascorbic acid type developer and an equivalent developer replenisher providing a regeneration amount of less than 150 ml/m 2 , characterized in that the said material has a buffering capacity of less than 6 mmole/m 2 , wherein said buffering capacity is defined as amount of alkali, expressed in mmole/square meter of film required to bridge across pH differences between the material and the developer.
Claim 2
Dependent Claim
117 words
Method of processing an exposed black-and-white light-sensitive silver halide photographic material having silver halide, coated in an amount, expressed as an equivalent amount of silver nitrate of less than 6 g/m 2 , said method comprising the steps of developing, fixing, rinsing and drying, making use in the developing step of an ascorbic acid type developer and an equivalent developer replenisher providing a regeneration amount of less than 150 ml/m 2 , characterized in that the said material has a buffering capacity of less than 6 mmole/m 2 , wherein said buffering capacity is defined as amount of alkali, expressed in mmole/square meter of film required to bridge across pH differences between the material and the developer.
Claim 3
Dependent Claim
34 words
Method according to claim 1, wherein said material has a ratio of buffering capacity to silver content in the undeveloped film, said silver content being expressed as equivalent amount of silver nitrate, below 0.6.
Claim 4
Dependent Claim
32 words
Method according to claim 1, wherein said material comprises a support and on at least one side thereof at least one light-sensitive emulsion layer having tabular emulsion grains rich in silver chloride.
Claim 5
Dependent Claim
45 words
Method according to claim 3, wherein said tabular grains are {111} tabular grains accounting for at least 50% of the total projective area of all grains, having at least 90 mole % of silver chloride and not more than 1 mole % of silver iodide.
Claim 6
Dependent Claim
45 words
Method according to claim 4, wherein said tabular grains are {100} tabular grains accounting for at least 30% of the total projective area of all grains, having at least 90 mole % of silver chloride and not more than 1 mole % of silver iodide.
Claim 7
Dependent Claim
32 words
Method according to claim 1, wherein said material comprises a support and on at least one side thereof at least one light-sensitive emulsion layer having cubic emulsion grains rich in silver chloride.
Claim 8
Dependent Claim
19 words
Method according to claim 3, wherein said grains are chemically ripened with agents providing sulphur, selenium and gold ions.
Claim 9
Dependent Claim
239 words
Method according to claim 1, wherein said ascorbic acid type developer comprises as a main developing agent or compound, the compound according to the formula (I) ##STR8## wherein in the formula (I) each of A, B and D independently represents an oxygen atom or NR 1 ; X represents an oxygen atom, a sulfur atom, NR 2 ; CR 3 R 4 ; C═O; C═NR 5 or C═S; Y represents an oxygen atom, a sulfur atom, NR' 2 ; CR' 3 R' 4 ; C═O; C═NR' 5 or C═S; Z represents an oxygen atom, a sulfur atom, NR" 2 ; CR" 3 R" 4 ; C═O; C═NR" 5 or C═S; n equals 0, 1 or 2; each of R 1 to R 5 , R' 2 to R' 5 and R" 2 to R" 5 independently represents hydrogen, alkyl, aralkyl, hydroxyalkyl, carboxyalkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl or heterocyclyl; and wherein R 3 and R 4 , R' 3 and R' 4 , R" 3 and R" 4 , may further form a ring together; and wherein in the case that X═CR 3 R 4 and Y═CR' 3 CR' 4 , R 3 and R' 3 and/or R 4 and R' 4 may form a ring and in the case that Y═CR' 3 R' 4 and Z═CR" 3 CR" 4 with n=1 or 2, R 3 and R' 3 and/or R 4 and R' 4 may form a ring.
Claim 10
Dependent Claim
20 words
Method according to claim 1, wherein said processing proceeds in a total dry-to-dry processing time of less than 100 seconds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-05-23 | 2003-11-22 | 2004-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-23 | 2007-11-22 | 2008-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-23 | 2011-11-22 | 2012-05-23 | $7700.00 | Window Closed / Lapsed |