US3867151A - General purpose monobath - Google Patents
General purpose monobath Download PDFInfo
- Publication number
- US3867151A US3867151A US358935A US35893573A US3867151A US 3867151 A US3867151 A US 3867151A US 358935 A US358935 A US 358935A US 35893573 A US35893573 A US 35893573A US 3867151 A US3867151 A US 3867151A
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- United States
- Prior art keywords
- composition
- per liter
- pyrazolidone
- monobath
- sodium
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/38—Fixing; Developing-fixing; Hardening-fixing
- G03C5/383—Developing-fixing, i.e. mono-baths
Definitions
- a monobath composition for the combined developing and fixing of silver halide photographic emulsions comprises four developing agents, one each selected from the following classes (a) 3-pyrazolidones; (b)
- the present invention relates to chemical compositions for the'combined developing and fixing of silver halide photographic emulsions.
- compositions for the combined developingand fixing of silver halide photographic emulsions have conventionally employed numerous silver halide developing agents.
- these agents are l-phenyl-3-pyrazolidone (commonly called Phenidone, a registered trademark of Ilford Ltd.), 2,4- diaminophenol dihydrochloride (Amidol), hydroquinone and ascorbic acid.
- Phenidone a registered trademark of Ilford Ltd.
- Azol 2,4- diaminophenol dihydrochloride
- hydroquinone and ascorbic acid.
- various combinations of these agents are well known for use in conventional developer formulations.
- 3,276,875 teaches'the use of Phenidone in combination with each of hydroquinone, amidol-and ascorbic acid, individually, and with a mixture of hydroquinone and ascorbic acid.
- Monobaths have also employed combinations of the various well known developing agents, as shown, for example, in US. Pat. Nos. 2,875,048 and 2,751,300 (Phenidone-asc orbic acid), US. Pat. Nos. 3,240,603 and 3,232,761 (Phenidone-hydroquinone) and Canadian Pat. Nos. 670,962 and 682,111 (Phenidonehydroquinone and Phenidone-amidol). 1
- every known monobath employing co mbinations of the aforementioned developers is a special purpose monobath in the sense that its composition is formulated to make it particularly effective in the de-.-
- the present invention provides a monobath composition
- a monobath composition comprising fourdeveloping agents (a) a 3- pyrazolidone; (b) an aminophenol; (c) a dihydroxybenzene; and (d) an enediol and a silver halide solvent.
- the developing agents employed are Phenidone, amidol, hydroquinone and ascorbic acid, respectively, and the silver halide solvent is sodium, potassium or ammonium thiosulfate or thiocyanate.
- the present invention comprehends a process for developing and fixing silver halide film by contacting the film with an alkaline-monobath comprising a developing agent selected from each of the aforementioned classes and a silver halide solvent.
- an alkaline-monobath comprising a developing agent selected from each of the aforementioned classes and a silver halide solvent.
- the present invention in its broadest form, provides an alkaline monobath composition containing four developing agents and a silver halide solvent, which monobath is effective for all films by suitable changes I in agitation and temperature.
- the silver halide developing agents employed in accordance with the present invention are selected, one
- R groups each represent various substitu-' ents such as hydrogen, alkyl or aryl groups.
- R can be hydrogen, a group such as alkyl prefera bly containing from 1 to 4 carbon atoms, or an aryl group of the benzene or naphthalene series substituted or not; and R R R and R5 can be hydrogen atoms, groups such as an alkyl group preferably of l to 4 carbon atoms, or an aryl group such as phenyl.
- l-phenyl-3-pyrazolidone is the preferred member of the 3-pyrazolidone class of agents for developing agents use in the present invention. Phenidone is preferred because it is commercially available in large quantities while other known, related developing agents having similar structure and characteristics are not widely available.
- the following compounds are representative of 3-pyrazolidone silver halide developing agents which l7. l-m-acetamidophenyl-4,4-diethyl-3-pyrazolidone- 18. l-p-(B-hydroxyethylphenyl )-4,4-dimethyl-3- pyrazolidone l9. 1 p-hydroxyphenyl-4,4-dimethyl-3-pyrazolidone 20.
- Z is a divalent aliphatic grouping which, with the carbon atoms in 4 and 5 positions of the pyrazolidone ring, completes a five-membered or membered cycloaliphatic ring and R is an aryl group, e.g., phenyl or naphthyl group.
- aryl groups may be substituted with hydroxy, alkoxy, oxyalkyl, amino, substituted amino, nitro, sulphonic or carboxylic groups or halogen atoms.
- These compounds include, for example, 1-phenyl-4,5-tetramethylene-3- pyrazolidone, l-phenyl-4,5-trimethylene-3- pyrazolidone and l-m-chlorophenyl-4,S-tetramethylene-3-pyrazolidone.
- the dihydroxybenzene silver halide developing agents which are useful in the monobath may be hydroquinone, resorcinol or pyrocatechol.
- aminophenol (the term aminophenol" will be employed hereinafter as generic to amino substituted phenols, including diaminophenols) for use in the present invention is 2,4-diaminophenol dihydrochloride, commonly known as amidol.
- amidol 2,4-diaminophenol dihydrochloride
- aminophenol compounds can be used in place of the amide] in the monobaths of the present invention. It will be appreciated, however, that amidol is the only member of the class that is manufactured and commercially available in quantity.
- aminophenol silver halide developing agents which are useful in the present monobath are the following:
- the enediol silver halide developing agents which are useful in the present monobath include the following:
- R R R and R each are selected from the class consisting of hydrogen and the radical CH R wherein R is hydrogen or a monovalent organic radical, selected from the group consisting of amino, cyano, halo, hydroxyl, carboxyl, sulfonyl, alkyl, cycloal kyl, aryl of the benzene or naphthalene series and alkaryl of the benzene or naphthalene series, at least one of said R R R and R being CH R Tetramethyl reductic acid is one particularly useful enediol.
- the monobath also includes a silver halide solvent which imparts the fixing capability to the composition.
- Suitable fixing agents are sodium, potassium and ammonium thiosulfates and thiocyanates.
- Inorganic sulfites such' as sodium or potassium sulfite, are utilized in their well-known role as preservatives for the developing agents.
- strongly basic compounds such as sodium or potassium hydroxide, are employed in sufficient quantity to produce an alkaline composition pH in the range 9.5 to 10.75.
- the pH is adjusted to the range 9.8 to l0.3 and most preferably to'the range It) to 10.2.
- the composition also includes a restrainer and grain reducer such as sodium or potassium bromide.
- Table 1 sets forth a broad embodiment of the monobaths of the present invention.
- a preferred antifoggant which also serves as a grain reducer, is benzotriazole in minute quantities up to about 0.1 gram/liter.
- ammonium thiosulfate is employed as the fixing agent in the monobath, it has been found to be a useful optional additive in quantities up to 3 grams/liter above any amount used as a fixing agent to increase development speed and to yield increased density images. It is also noteworthy that where hard water conditions prevail some flocculation may occur in the monobath. To remedy this it is desirable to include up to Zgrams of a water softener or water conditioner per liter of composition. Particularly preferred for this purpose is so dium hexametaphosphate, which may be provided as the commercially available product Calgon, manufactured by the Calgon Corporation.
- Table Ill sets 88% Ethanolamine 140 g forth mean agitation modes for optimum performance fllcxid t A d 138 g of the monobaths with each emulsion. It w ll be apprefi a g g 80 g ciated that the agitation modes are not rigorous, un- Ethylene Glycol g varying criteria, but rather are guidelines which, if followed within about a 20 percent permissible variation, One ounce of the post-hardener concentrate diluted will yield consistently satisfactory results. with water makes 1 quart of rinse solution.
- Emulsion hardening when processing with mono- EXAMPLE/V1 baths has heretofore taken the form'of (a) prehardening the emulsion in a hardening solution, or (b) incor 85% glutaraldehyde 10 ml porating a hardener in the monobath. Neither tech- 40 z o e 1 liter nique has been found to be satisfactory. Prehardening is itself time consuming, requiring, for example, 90 seconds using the solution of U.S. Pat. No. Re. 26,601.
- a glutaraldehyde post-hardener is effective but suffers addition, following prehardening a thorough rinsing is from the problem that it ages at a muchfa'ster rate than necessary to avoid prehardener carry-over into the other post-hardeners, which may last for years. monobath and contamination of'the monobath. Incor- It should be appreciated that the post-hardening soluporation ofa hardener into a monobath, whether by detions of Examples IV-Vl are merely illustrative of the sign or through inadvertence, as by carry-over, typinumerous hardening solutions which are suitable.
- any known prehardening solution shelf life of the monobath For cally causes a loss of emulsion speed and shortens the example, virtually any known prehardening solution shelf life of the monobath. For example, upon incorcan also be used for post-hardening.
- known poration of an aldehyde hardener in a monobath a pH and temperature conditions for prehardening are slight discoloration of the monobath evidences an inalso satisfactory for post-hardening. creased rate of monobath oxidation with an attendant A particular advantage of the monobath composiloss in development capability.
- break downtions of the present invention is the flexibility they of the aldehyde hardener itself in the monobath makes allow in commercial packaging configurations to insure it doubtful whether effective hardening can be prolonged shelf life.
- the primary monobath ingredients except for the alkaand kept on the shelffor 3 to 6 months.
- linity agent and the four developers are provided in dry It has been found, contrary to some reported obserpowdered form.
- the alkalinity agent is a separately vations (see, Sasai and Mil, Studies on Photographic packaged aqueous concentrate and the developers are Monobaths Containing Posassium Thiocyanate, Photoprovided in powdered, pre-mixed form in a number of graphic Science and Engineering, Volume 8, No. 3, individual compartments, each compartment containpages 270-275 1964), that hardening following develing sufficient developer to activate, for example, 16 opment and fixation, i.e., post-hardening, is effective, ounces of monobath solution.
- the powdered primary ingredients are dissolved in about 48 ounces of water at 52C to form a concentrate having a shelf life in a tightly stoppered bottle of at least one year.
- the monobath the powdered primary ingredients are dissolved in about 48 ounces of water at 52C to form a concentrate having a shelf life in a tightly stoppered bottle of at least one year.
- CONFIGURATION 1 The NaOH concentrate is added to 800 mls H O.
- Basic mix (2) is then added and when dissolved additional water is added to make 1 liter.
- Basic Mix (2) may beadded in increments to activate only a portion of the diluted NaOh concentrate.
- CONFIGURATION 2 t The NaOh concentrate is added to 800 mls H O.
- Base mix (2) Y is then added and'the resultant solution stored'prior to use at which time it is activated by add ing Base mix (2') Z and H to make 1 liter.
- Base mix (2) Z may be added in increments to activate only a portion of the stored solution.
- CONFIGURATION 3 l The NaOh concentrate is added to 800 mls of H 0.
- Base mix (2) Y and ingredient (2)(d) are then added and the resultant solution is stored prior to use at which time it is activated by adding ingredients (2)(e) (2)(f) and (2)(g).and H O to make 1 liter.
- ingredients 2)(e), (2)(f), and (2)(g) may be added in increments to activate only a portion of the stored solutlon.
- CONFIGURATION 4 The NaOh concentrate is added to 800 mls H O.
- Base mix (2) Y plus ingredients (2)(d) and (2)(g) are then added and the resultant solution is stored prior to use at which time it is activated by adding ingredients (2)(e) and (2)(f) to the solution and H 0 to make 1 liter.
- ingredients (2((e) and (2)(1) may be added in increments to activate only a portion of the stored solution.
- composition and packaging of this monobath provide a photographic worker with: (1) a monobath that produces a maximum of shadow detail and full emulsion speed; (2) a primary aqueous mixture that has a shelf life of at least six months to one year prior to activationjand- (3) a methodof activation that enables the worker to activate the solution only when he needs to process film ensuring a fresh solution.
- a monobath that produces a maximum of shadow detail and full emulsion speed
- a primary aqueous mixture that has a shelf life of at least six months to one year prior to activationjand- (3) a methodof activation that enables the worker to activate the solution only when he needs to process film ensuring a fresh solution.
- An aqueous composition for the combined developing and fixing of exposed silver halide photographic emulsions comprising the following ingredients in the weight proportion ranges indicated per liter of composition:
- Enediol developer selected from the groupconsisting of ascorbic acid, d-araboascorbic acid, reductic acid, 2- ozytetronic acid, 4-aryl-2ozytetronic acid, .l-aryl?- ozytetronimidc. isoascorbic acid'and cnediols having the chemical structure represented by the formula wherein R R R and R are selected from the group consisting of hydrogen and the radical CH;R R is selected from hydrogen and a monovalcnt radical selected from the group consisting of amino, cyano,
- R R R and R4 being the radical CH R Inorganic sulfite preservative 20 to grains.
- Alkaline agent 1 to 10 grams 3 to 7 grams.
- Fixing agent selected from sodium, potassium and 60lo grams.
- ammonium thzosulfates and thincganmes ammonium thzosulfates and thincganmes.
- composition as claimed' in claim 1, wherein said 3-pyrazolidone developer is selected from developing agents having the following chemical structure:
- R R R R and R are selected from hydrogen, alkyl groups containing from 1 to 4 carbon atoms and aryl groups selected from the benzene and naphthalene series.
- composition, as claimed in claim 2, wherein said 3-pyrazolidone is l-phenyl-3-pyrazolidone.
- composition as claimed in claim 1, wherein said 11 aminophenol developer is 2,4-diaminophenol dihydrochloride.
- composition as claimed in claim 1, comprising the following ingredients in the weight proportion ranges indicated per liter ofcomposition:
- composition as claimed in claim 7, wherein said inorganic sulfite preservative is selected from sodium and potassium sulfite.
- composition as claimed in claim 7, wherein said alkaline agent is selected from sodium and potassium hydroxide.
- composition as claimed in claim 7, wherein said restrainer is selected from sodium and potassium bromide.
- composition as claimed in claim 7, wherein said pH is in the range 9.8 10.3
- composition as claimed in claim 7, further including at least one of the following additional ingredients:
- composition, as claimed in claim 12, wherein said additional ingredient is a grain reducer selected from sodium and potassium thiocyanate.
- composition as claimed in claim 12, wherein said additional ingredient is benzotriazole.
- composition as claimed inclaim 12, wherein said additional ingredient is ammonium thiosulfate.
- composition as claimed in claim 15, wherein said water softening agent is sodium hexametaphos- 18.
- An aqueous compositionfor the combined developing and fixing of exposed silver halide photographic emulsions comprising the following ingredients in the weight proportions indicated per liter of composition:
- Enediol developer selected from the group consisting of ascorbic acid, darab0ascorbic acid, reduetic acid, 2- orytetronic acid, .l-aryl-E-oxyletronic acid, .l-aryl-Q- oz letronimide, isoascorbic acid and cnediOZ-y having the chemical structure represented by the formula wherein R R R and R are selected from the group consisting of hydrogen and the radical C[IgR, R is selected from hydrogen and a monovalerzl radical selected from the group consisting of amino, cg arzo.
- R H It and R4 being the radical CII I ⁇ ;,.
- 3-pyrazolidone developer is selected from developing agents having the following chemical structure:
- R R R R and R are selected from hydrogen, alkyl groups containing from 1 to 4 carbon atoms and aryl groups selected from the benzene and naphthalene series.
- sai hardening bath includes a silver halide emulsion hardener selected from acid alum and aldehyde hardeners.
- a dry mixture all ingredients of which are adapted to be admixed and dissolved in water to pro-
- a dihydroxybenzene developer selected from the group consisting of hydroquinone, resorcinol and pyrocatechol;
- An amlnophenol developer selected from the group consisting of nominaphenol, N-methyl-p-aminophenol, 2,4-dianzinphenol, 2,4-diamin0resorinethyl-Q-methglaminophenol, (Lamina-441ieihyl-2-meihylaminophenol, 5- dimeihylamin02-1):ethylaminophenol, l.24,-lriaminoherzzene, a-meih I- 1,2,4-triarninobenzene, .l-hgdroag, 2,.i-diaminodiphch lamina, 4,2,4-lriraininofdiphenylamine, 1,3-diarnina-4,T-aihgdroxybenzene, and the acid sails ereo
- An enediol developer selected from the group consisting of ascorbic acid, d-arabaascorbic acid, reductz
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Abstract
Description
Claims (32)
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US358935A US3867151A (en) | 1973-05-10 | 1973-05-10 | General purpose monobath |
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US358935A US3867151A (en) | 1973-05-10 | 1973-05-10 | General purpose monobath |
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2344874A1 (en) * | 1976-03-15 | 1977-10-14 | Anneman William | Low contrast developer for high contrast silver halide emulsion - with (micro)fine grains contains pyrazolidone, hydroquinone, metol etc. |
US4083722A (en) * | 1976-03-15 | 1978-04-11 | William Alexander Anneman | Developer composition and process for developing photographic film |
US4415465A (en) * | 1981-03-13 | 1983-11-15 | Hitachi, Ltd. | Heat-storing composition |
US4816384A (en) * | 1986-10-09 | 1989-03-28 | E. I. Du Pont De Nemours And Company | Powdered packaged developer |
US4917992A (en) * | 1985-03-15 | 1990-04-17 | Ciba-Geigy Ag | Developing agents |
WO1993012463A1 (en) * | 1991-12-12 | 1993-06-24 | Kodak Limited | Photographic developer stabilisation |
EP0732619A1 (en) * | 1995-02-21 | 1996-09-18 | Agfa-Gevaert N.V. | Developing method and method for developing an exposed photographic silver halide material |
US5834171A (en) * | 1996-01-16 | 1998-11-10 | Konica Corporation | Solid processing composition for silver halide photographic light sensitive material |
US5895743A (en) * | 1996-12-30 | 1999-04-20 | Agfa-Gevaert, N.V. | Method of processing light-sensitive silver halide photographic materials |
US5900355A (en) * | 1998-03-26 | 1999-05-04 | Eastman Kodak Company | Method of making uniformly mixed dry photographic processing composition using hot melt binder |
US5908737A (en) * | 1998-03-23 | 1999-06-01 | Eastman Kodak Company | Opaque developing composition and its use to process roomlight handleable black-and-white photographic elements |
US5912107A (en) * | 1998-03-23 | 1999-06-15 | Eastman Kodak Company | Opaque developing/fixing monobath and its use for processing roomlight handleable black-and-white photographic elements |
US5922521A (en) * | 1998-03-26 | 1999-07-13 | Eastman Kodak Company | Uniformly mixed dry photographic processing composition and method of preparation |
US5935770A (en) * | 1997-11-14 | 1999-08-10 | Eastman Kodak Company | Composition for processing roomlight handleable radiographic films using two-stage development |
US5945265A (en) * | 1998-03-26 | 1999-08-31 | Eastman Kodak Company | Uniformly mixed dry photographic developing composition containing antioxidant and method of preparation |
US5955247A (en) * | 1997-07-09 | 1999-09-21 | Konica Corporation | Method for processing silver halide photographic light-sensitive material |
US5984538A (en) * | 1997-11-14 | 1999-11-16 | Eastman Kodak Company | Hand-held film developing device and kit for roomlight processing of black-and-white photographic elements |
US6379877B1 (en) | 1995-02-21 | 2002-04-30 | Agfa-Gevaert | Method for developing an exposed photographic silver halide material |
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US2685515A (en) * | 1953-08-03 | 1954-08-03 | Eastman Kodak Co | Photographic developer composition |
US3276875A (en) * | 1963-12-02 | 1966-10-04 | Du Pont | Developing composition with pyrrolidone anti-sludging agent |
US3345166A (en) * | 1961-03-09 | 1967-10-03 | Polaroid Corp | Photographic process whereby a fully developed and fixed negative is formed concurrently with a positive silver transfer image |
US3542554A (en) * | 1967-11-30 | 1970-11-24 | Eastman Kodak Co | Mercapto-substituted hydroquinone developing agents |
US3615513A (en) * | 1965-11-01 | 1971-10-26 | Eastman Kodak Co | Inhibition of silvering in photographic processing solutions |
US3615440A (en) * | 1968-10-25 | 1971-10-26 | Polaroid Corp | Novel photographic compositions and processes |
US3730716A (en) * | 1971-05-19 | 1973-05-01 | Polaroid Corp | Silver image stabilization with noble metal compounds and alpha,beta-enediol developer |
-
1973
- 1973-05-10 US US358935A patent/US3867151A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US2685515A (en) * | 1953-08-03 | 1954-08-03 | Eastman Kodak Co | Photographic developer composition |
US3345166A (en) * | 1961-03-09 | 1967-10-03 | Polaroid Corp | Photographic process whereby a fully developed and fixed negative is formed concurrently with a positive silver transfer image |
US3276875A (en) * | 1963-12-02 | 1966-10-04 | Du Pont | Developing composition with pyrrolidone anti-sludging agent |
US3615513A (en) * | 1965-11-01 | 1971-10-26 | Eastman Kodak Co | Inhibition of silvering in photographic processing solutions |
US3542554A (en) * | 1967-11-30 | 1970-11-24 | Eastman Kodak Co | Mercapto-substituted hydroquinone developing agents |
US3615440A (en) * | 1968-10-25 | 1971-10-26 | Polaroid Corp | Novel photographic compositions and processes |
US3730716A (en) * | 1971-05-19 | 1973-05-01 | Polaroid Corp | Silver image stabilization with noble metal compounds and alpha,beta-enediol developer |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2344874A1 (en) * | 1976-03-15 | 1977-10-14 | Anneman William | Low contrast developer for high contrast silver halide emulsion - with (micro)fine grains contains pyrazolidone, hydroquinone, metol etc. |
US4083722A (en) * | 1976-03-15 | 1978-04-11 | William Alexander Anneman | Developer composition and process for developing photographic film |
US4415465A (en) * | 1981-03-13 | 1983-11-15 | Hitachi, Ltd. | Heat-storing composition |
US4917992A (en) * | 1985-03-15 | 1990-04-17 | Ciba-Geigy Ag | Developing agents |
US4816384A (en) * | 1986-10-09 | 1989-03-28 | E. I. Du Pont De Nemours And Company | Powdered packaged developer |
WO1993012463A1 (en) * | 1991-12-12 | 1993-06-24 | Kodak Limited | Photographic developer stabilisation |
EP0732619A1 (en) * | 1995-02-21 | 1996-09-18 | Agfa-Gevaert N.V. | Developing method and method for developing an exposed photographic silver halide material |
US6379877B1 (en) | 1995-02-21 | 2002-04-30 | Agfa-Gevaert | Method for developing an exposed photographic silver halide material |
US5834171A (en) * | 1996-01-16 | 1998-11-10 | Konica Corporation | Solid processing composition for silver halide photographic light sensitive material |
US5895743A (en) * | 1996-12-30 | 1999-04-20 | Agfa-Gevaert, N.V. | Method of processing light-sensitive silver halide photographic materials |
US5955247A (en) * | 1997-07-09 | 1999-09-21 | Konica Corporation | Method for processing silver halide photographic light-sensitive material |
US5935770A (en) * | 1997-11-14 | 1999-08-10 | Eastman Kodak Company | Composition for processing roomlight handleable radiographic films using two-stage development |
US5984538A (en) * | 1997-11-14 | 1999-11-16 | Eastman Kodak Company | Hand-held film developing device and kit for roomlight processing of black-and-white photographic elements |
US5912107A (en) * | 1998-03-23 | 1999-06-15 | Eastman Kodak Company | Opaque developing/fixing monobath and its use for processing roomlight handleable black-and-white photographic elements |
US5908737A (en) * | 1998-03-23 | 1999-06-01 | Eastman Kodak Company | Opaque developing composition and its use to process roomlight handleable black-and-white photographic elements |
US5972581A (en) * | 1998-03-23 | 1999-10-26 | Eastman Kodak Company | Opaque developing/fixing monobath and its use for processing roomlight handleable black-and-white photographic elements |
US5922521A (en) * | 1998-03-26 | 1999-07-13 | Eastman Kodak Company | Uniformly mixed dry photographic processing composition and method of preparation |
US5945265A (en) * | 1998-03-26 | 1999-08-31 | Eastman Kodak Company | Uniformly mixed dry photographic developing composition containing antioxidant and method of preparation |
US5972582A (en) * | 1998-03-26 | 1999-10-26 | Eastman Kodak Company | Uniformly mixed dry photographic processing composition using hot melt binder |
US6110654A (en) * | 1998-03-26 | 2000-08-29 | Eastman Kodak Company | Uniformly mixed dry photographic processing composition |
US5900355A (en) * | 1998-03-26 | 1999-05-04 | Eastman Kodak Company | Method of making uniformly mixed dry photographic processing composition using hot melt binder |
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Owner name: KATZ, JEROME; ROCHESTER, NY. Free format text: CONDITIONAL ASSIGNMENT;ASSIGNOR:DELAWARE PHOTOGRAPHIC PRODUCTS, INC.;REEL/FRAME:004157/0821 Effective date: 19830321 Owner name: KATZ, JEROME, NEW YORK Free format text: CONDITIONAL ASSIGNMENT;ASSIGNOR:DELAWARE PHOTOGRAPHIC PRODUCTS, INC.;REEL/FRAME:004157/0821 Effective date: 19830321 |
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AS | Assignment |
Owner name: DELAWARE CAMERA MART, INC.; BUFFALO, NY. Free format text: ASSIGNMENT OF 1/2 OF ASSIGNORS INTEREST;ASSIGNOR:DELAWARE PHOTOGRAPHIC PRODUCTS. INC.;REEL/FRAME:004157/0825 Effective date: 19821120 Owner name: DELAWARE CAMERA MART, INC., NEW YORK Free format text: ASSIGNMENT OF 1/2 OF ASSIGNORS INTEREST;ASSIGNOR:DELAWARE PHOTOGRAPHIC PRODUCTS. INC.;REEL/FRAME:004157/0825 Effective date: 19821120 |