US2815284A - Developers for photographic silver halide papers - Google Patents
Developers for photographic silver halide papers Download PDFInfo
- Publication number
- US2815284A US2815284A US347603A US34760353A US2815284A US 2815284 A US2815284 A US 2815284A US 347603 A US347603 A US 347603A US 34760353 A US34760353 A US 34760353A US 2815284 A US2815284 A US 2815284A
- Authority
- US
- United States
- Prior art keywords
- papers
- stilbene
- developers
- sodium
- silver halide
- Prior art date
- 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.)
- Expired - Lifetime
Links
- -1 silver halide Chemical class 0.000 title claims description 10
- 229910052709 silver Inorganic materials 0.000 title claims description 8
- 239000004332 silver Substances 0.000 title claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 2
- 238000007792 addition Methods 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 10
- 125000001424 substituent group Chemical group 0.000 description 8
- 229910052708 sodium Inorganic materials 0.000 description 7
- 239000011734 sodium Substances 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- BNDRECGBDISUAI-UHFFFAOYSA-N 6-(2-phenylethenyl)cyclohexa-2,4-diene-1,1-disulfonic acid Chemical compound OS(=O)(=O)C1(S(O)(=O)=O)C=CC=CC1C=CC1=CC=CC=C1 BNDRECGBDISUAI-UHFFFAOYSA-N 0.000 description 5
- 150000002894 organic compounds Chemical class 0.000 description 5
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 5
- 125000003118 aryl group Chemical group 0.000 description 4
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical class C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- PJANXHGTPQOBST-VAWYXSNFSA-N Stilbene Natural products C=1C=CC=CC=1/C=C/C1=CC=CC=C1 PJANXHGTPQOBST-VAWYXSNFSA-N 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 159000000000 sodium salts Chemical class 0.000 description 3
- 235000021286 stilbenes Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical group 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 150000001412 amines Chemical group 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000009994 optical bleaching Methods 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 125000003107 substituted aryl group Chemical group 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- NSMMFSKPGXCMOE-UHFFFAOYSA-N 2-[2-(2-sulfophenyl)ethenyl]benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1C=CC1=CC=CC=C1S(O)(=O)=O NSMMFSKPGXCMOE-UHFFFAOYSA-N 0.000 description 1
- BKKCHPZQDBOJLI-UHFFFAOYSA-N 3-amino-6-[2-(4-aminophenyl)ethenyl]cyclohexa-2,4-diene-1,1-disulfonic acid Chemical class NC1=CC(C(C=C1)C=CC1=CC=C(C=C1)N)(S(=O)(=O)O)S(=O)(=O)O BKKCHPZQDBOJLI-UHFFFAOYSA-N 0.000 description 1
- REJHVSOVQBJEBF-OWOJBTEDSA-N 5-azaniumyl-2-[(e)-2-(4-azaniumyl-2-sulfonatophenyl)ethenyl]benzenesulfonate Chemical compound OS(=O)(=O)C1=CC(N)=CC=C1\C=C\C1=CC=C(N)C=C1S(O)(=O)=O REJHVSOVQBJEBF-OWOJBTEDSA-N 0.000 description 1
- REJHVSOVQBJEBF-UHFFFAOYSA-N DSD-acid Natural products OS(=O)(=O)C1=CC(N)=CC=C1C=CC1=CC=C(N)C=C1S(O)(=O)=O REJHVSOVQBJEBF-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 125000004442 acylamino group Chemical group 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 125000002490 anilino group Chemical group [H]N(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- OMYYIKYIUKPRDH-UHFFFAOYSA-L disodium;5-(phenylcarbamoylamino)-2-[2-[4-(phenylcarbamoylamino)-2-sulfonatophenyl]ethenyl]benzenesulfonate Chemical compound [Na+].[Na+].C=1C=C(C=CC=2C(=CC(NC(=O)NC=3C=CC=CC=3)=CC=2)S([O-])(=O)=O)C(S(=O)(=O)[O-])=CC=1NC(=O)NC1=CC=CC=C1 OMYYIKYIUKPRDH-UHFFFAOYSA-L 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- G03C5/29—Development processes or agents therefor
- G03C5/305—Additives other than developers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/134—Brightener containing
Definitions
- the mentioned discolorations are caused by an absorption of light in the short-wave part of the visible spectrum between about 4000 A. and about 5500 A. According to the present invention these discolorations are inhibited by special additions to the developers which v to the paper
- these discolorations are inhibited by special additions to the developers which v to the paper
- optical bleaching agents for photographic papers such compounds are proposed for the same purpose as additions to the layers. that it is much better for various reasons, to use these compounds in developers for photographic papers.
- said compounds cannot affect the properties of the photographic layers, which are very sensitive in this regard especially during storage. which cannot be added in technical pure form to the photographic layers may be used so in the developers.
- Also there are more possibilities When using the fluorescent compounds in the developers to get best suited effects for the prints by additions chosen optimally by kind and quantity, as if the layers of the photographic papers would already contain such a compound.
- Fluorescent organic compounds which can be used according to the present invention as additions to the developers for photographic papers, have been described in the literature. Especially suited for this purpose are,
- Me represents a-substituent selected from the group consisting of alkali metal, alkali earth metal, ammonium and substituted ammonium
- a and A may be the same and each represents a substituent selected from the group consisting of CO-R CONH-R and wherein R represents a substituent selected from the group'consisting of aryl and substituted aryl, R represents a substituent selected from the group consisting of hydrogen, alkyl, aryl and substituted aryl, R represents an amine residue, and R represents a substituent selected from the group consisting of Cl, OH, NH and an amine residue.
- Suitable compounds are, for example:
- This developer produces with all kinds of photographic papers purer and brighter whites than the same developer without the addition according to this invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Developing Agents For Electrophotography (AREA)
- Color Printing (AREA)
Description
United States Patent-O DEVELOPERS FOR PHOTOGRAPHIC SILVER HALIDE PAPERS Ernst Tausch, Berlin-Charlottenburg, Germany, assignor to Photographica G. in. b. H., Berlin-Charlottenburg, Germany, a corporation of Germany No Drawing. Application April 8, 1953, Serial No. 347,603
Claims priority, application Germany April 10, 1952 5 Claims. (Cl. 96-66) This invention relates to new developers for the treatment of photographic silver halide papers.
It is known that under unfavorable conditions photographic papers incline to produce a yellowish fog, mainly consisting of colloidal silver. Alsothe oxydation products of the developing agents may cause a similar yellowish discoloration of the layer and the support of photographic papers if the developer is exhausted and colored brown. A yellowish or off-white tint of the photographic prints also may be caused by a not pure White color of the paper support itself.
The mentioned discolorations are caused by an absorption of light in the short-wave part of the visible spectrum between about 4000 A. and about 5500 A. According to the present invention these discolorations are inhibited by special additions to the developers which v to the paper It is already known, that textiles and papers are treated to brighten their whites with fluorescent organic compounds, so called optical bleaching agents. For photographic papers such compounds are proposed for the same purpose as additions to the layers. that it is much better for various reasons, to use these compounds in developers for photographic papers. Thus said compounds cannot affect the properties of the photographic layers, which are very sensitive in this regard especially during storage. which cannot be added in technical pure form to the photographic layers may be used so in the developers. Also there are more possibilities When using the fluorescent compounds in the developers to get best suited effects for the prints by additions chosen optimally by kind and quantity, as if the layers of the photographic papers would already contain such a compound.
It was surprising and not to be foreseen, that said fluorescent organic compounds without injury of their efliciency could be added to the developers, since it is the usual practice to remove optical bleaching agents from textiles by treatment with soda solution. It was found, that the said fluorescent organic compounds can be used without trouble if they were chosen in the right manner and quantity.
Fluorescent organic compounds which can be used according to the present invention as additions to the developers for photographic papers, have been described in the literature. Especially suited for this purpose are,
Many of said compounds It was found,
for example, the derivatives of the 4,4'-diaminostilbene- 2,2 '-disulfonic acid according to the following formula:
| S OaMe $03M? in which Me represents a-substituent selected from the group consisting of alkali metal, alkali earth metal, ammonium and substituted ammonium, while A and A may be the same and each represents a substituent selected from the group consisting of CO-R CONH-R and wherein R represents a substituent selected from the group'consisting of aryl and substituted aryl, R represents a substituent selected from the group consisting of hydrogen, alkyl, aryl and substituted aryl, R represents an amine residue, and R represents a substituent selected from the group consisting of Cl, OH, NH and an amine residue.
Symmetrical compounds according to this formula are:
I. 1 4,4-di-[acylamino1-stilbenes RvCO-NH OH=CH NH-CO-Rr EEOaMe SOaMe 4,4-di-[ureido]-stilbenes m-NH-o O-NH- III.
l S OaMe SOiMe Also according to this formula are unsymmetrical stilbene derivatives, described in the literature, which may be obtained from the 4-nitro-4'-aminostilbene-2,2'-disul- .1 fonic acid, e. g. 4-[ureido]-4-[acylamino]-stilbenes or 4-[triazin-(l",3",5")-yl-(2") amino] -4' [acylaminolstilbenes. v
Suitable compounds are, for example:
(1) Sodium 4,4-di-(benzamido)-stilbene-2,2-disu1fonate (2) Sodium 4,4'-di-(p-aminobenzamido)-stilbene-2,2'-disulfonate (3) Sodium 4,4-di-(p-acetaminobenzamido)-stilbene-2, 2 -disulfonate v (4) Sodium 4,4'-di-(2,5-dimethoxybenzamido)-stilbene- 2,2'-disulfonate (5) Sodium 4,4'-di-(p-methylaminobenzamido)-stilbene- '2,2-disulfonate (6) Sodium 4,4'-di-(methylureido)-stilbene-2,2-disulfonate (7) Sodium 4,4'-di-(pheny1ureido)-stilbene-2,2'-disulfonate (8) Sodium 4,4'-di-(p-tolylureido)-stilbene-2,2'-disulfo nate (9) Sodium 4,4-di-(p-chlorphenylureido)-stilbene-2,2'-
disulfonate (15) 'Sodium azin (l",3",'5") yl (2") amino] l stilbene 2,2- disulfonate (17) Sodium 4-phenylacetamino 4' [4",6-diamino;tri-
azin (1,3",5") yl (2") amino] stilbene 2,2-
disulfonate (18) Sodium 4 acetamino 4 (phenylureido) stilbene-2,2-disulfonate (19) Sodium 4 (2"-ethoxy 4" methyl-benzarnido)- 4'-(phenylureido) -stilbene 2,2'-disulfonate It should be emphasized, that the said compounds themselves-are not the subject ot: thepresent= inventiom .since they r do not: limitthe fluorescent organic :compoundst snited as additions aecording todhis invention to developers :for photographic papers, they are mentioned as examples only;
' The above mentione'd compounds have the mutual property to attach themselves in a substantive mannerto the support and the-layers of-*thephotographic-"papers.
As developers for .photographicpapers which accord! ing to the present-invention can be'improved by addition of fluorescent organic compounds, allkinds' of-developers may be cited which normally are used between exposure and drying for the treatment of photographic silver halide papers. Developersaccording to this in vention have special advantages for papers designed for usein connection with color photography, in particular multi-layer color papers. The present invention will be illustrated by the following examples without limiting it by the discussedwases:
is 'added' 0.2 g. of sodium 4,4'-di-(phenylureido)-stilbene- 2,2'-disulfonate. It produces photographic prints. with much purer and brighter whites than .the same developer withoutthis addition. 'Theoth'er properties ofi'the developer'will not be changedby'the addition.
EicamplezZ To a manufactured paper developer of. the composition:
Grams .I. p-methylaminophenolsulfate-. 1'5 Hydroquinone '60 II.-Sodium* sulfite (desicc.) 225 Sodium carbonate (desicc.) 340 Potassium bromide 1 10 is added (in II) 2.5 g. sodium 4,4-di-[4"-hydroxy-6'"- disulfonate. -I' and' II were dissolved' succes'sively in-S li'tl'pfwater: In use, 1 part developer is diluted with 2 partsofwater.
This developer produces with all kinds of photographic papers purer and brighter whites than the same developer without the addition according to this invention.
Sodium sulfite (desicc.) 1 Potassium carbonate Potassium. br 0.5
Water to 1000 um.
is added. 0.2 g..-of-the-.same. stilbene 'derivate as-inExample 2. It produces a better white at the development of the color-prints on multilayer'color' papers than without the addition.
'Variouschanges and modificationsjmay be made without departing from the'spirit and scope of the present invention =and-it is intended that such obvious changes and *modificationstbe"embraced by the annexed claims.
Having thus described the invention,.what is claimed as-new an'd-desiredto be secured :by Letters Patent, is: l.-'-In-'the 'process of producing photographic images withimproved i whiteness, the :step of processing exposed light-sensitive silver"halide-coated papers with a silver halide developer-having 'dissolved therein a substantially colorless derivative of 4,4'-diamino-stilbene-2,2-disulphonic acid, said derivative'absorbing ultraviolet radiation of between about"3', 000 'Angstrom units and 4,000 Angstrom units and emittingifiuorescent light of between about"4,000-'Angstrom"units and 5,500 Angstrom units and having'the formula:
some SOaMe inwhich Me' represents .a substituent .selected from the 'group 'consisting'of "alkali metal, alkali earth metal and ammonium; while 'A and Ag each represents a substituent selected 'from: the group consisting of CO'-R CO NH R and wherein'R' represents aryl, R represents a substituent selectedtfromthe: group consisting of hydrogen;.alkyl and aryl, R representsamino andlRu represents a substituent selected from the group;consis;ting of,,.Cl, OH and amino.
2. Therprocess.accordingto claim-l; wherein the derivativeof 4,4-diamino stilbene2,2rdisulphonic acid is the sodium salt of 4,4'.-di-(phenylureido)-stilbene-2,2-disulphonic acid.
3. 'The process according to. claim 2, said sodium ,salt of 4,4-di'-'(phenylureido) stilbene-2,2'-disulphonic acid being present in an amount ranging'between about 0.05 and LO'gram' per liter of developer.
4. The process according to claim 1; wherein the derivative of I 4',4 '-diamin0*stilbene-2",2'-disulphonic acid is the sodium salt of 4;4''-'di-[4"'-hydroxy-6'-anilino-triazin- (l"',3",5'-") ---yl (2") --amino] stilbene 2,2' 'di-sulphonic acid.
5.: The 1 process. according. to claim 4, said sodium salt of 4,4 di [4" hydroxy 6-. -.anilino triazin- (-1.,3'.,5) yl..-h(2") amino] stilbene 2,2 disulphonic acid being presentiman amount ranging between about 0.05 and...l.0.:gram,per1liter of-developer. 7
(References on following page) References Cited in the file of this patent UNITED STATES PATENTS 6 FOREIGN PATENTS 878,823 France Nov. 2, 1942 498,125 Belgium Jan. 2, 1951 502,230 Belgium Apr. 14, 1951 (Corresponding to Great Britain No. 672,803, May 28, 1952)
Claims (1)
1. IN THE PROCESS OF PRODUCING PHOTOGRAPHIC IMAGES WITH IMPROVED WHITENESS, THE STEP OF PROCESSING EXPOSED LIGHT-SENSITIVE SILVER HALIDE-COATED PAPERS WITH A SILVER HALIDE DEVELOPER HAVING DISSOLVED THEREIN A SUBSTANTIALLY COLORLESS DERIVATIVE OF 4,4''-DIAMINO-STILBENE-2,2''-DISULPHONIC ACID, SAID DERIVATIVE ABSORBING ULTRAVIOLET RADIATION OF BETWEEN ABOUT 3,000 ANGSTROM UNITS AND 4,000 ANGSTROM UNITS AND EMITTING FLUORESCENT LIGHT OF BETWEEN ABOUT 4,000 ANGSTROM UNITS AND 5,500 ANGSTROM UNITS AND HAVING THE FORMULA:
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP7453A DE971467C (en) | 1952-04-10 | 1952-04-10 | Developer for photographic silver halide papers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2815284A true US2815284A (en) | 1957-12-03 |
Family
ID=7361193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US347603A Expired - Lifetime US2815284A (en) | 1952-04-10 | 1953-04-08 | Developers for photographic silver halide papers |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2815284A (en) |
| DE (1) | DE971467C (en) |
| GB (1) | GB736123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587195A (en) * | 1982-09-14 | 1986-05-06 | Konishiroku Photo Industry Co., Ltd. | Method of processing silver halide photographic light-sensitive material |
| US5043253A (en) * | 1987-12-11 | 1991-08-27 | Fuji Photo Film Co., Ltd. | Method for commonly processing two different silver halide color photographic light-sensitive materials |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE498125A (en) * | ||||
| BE502230A (en) * | 1950-04-06 | |||
| US2303917A (en) * | 1942-04-01 | 1942-12-01 | Eastman Kodak Co | Luminescent material |
| FR878823A (en) * | 1941-02-18 | 1943-02-04 | Ig Farbenindustrie Ag | Process for emphasizing whites and the luminous power of the surface color of photographic images |
| US2316595A (en) * | 1938-03-23 | 1943-04-13 | Kallmann Hartmut Israel | Photographic plate or film for the investigation of bodies or substances by means of neutrons |
| GB672803A (en) * | 1949-09-16 | 1952-05-28 | Kodak Ltd | Improvements in sensitive photographic papers |
| US2639900A (en) * | 1948-12-11 | 1953-05-26 | Henry G Schaefer | Simplified space heating radiator mounted on pipe |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB442530A (en) * | 1934-08-08 | 1936-02-10 | Ici Ltd | Improvements in the preparation of safety paper |
| GB522672A (en) * | 1939-06-02 | 1940-06-24 | Meyer Hans | Treating articles, substances or materials of a yellowish or off-white tint so as to obtain a pure white appearance |
| NL58372C (en) * | 1941-02-18 | |||
| FR1000735A (en) * | 1949-11-16 | 1952-02-15 | Lumiere Soc | Improvements to papers and other photographic surfaces |
-
1952
- 1952-04-10 DE DEP7453A patent/DE971467C/en not_active Expired
-
1953
- 1953-04-08 US US347603A patent/US2815284A/en not_active Expired - Lifetime
- 1953-04-09 GB GB9637/53A patent/GB736123A/en not_active Expired
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE498125A (en) * | ||||
| US2316595A (en) * | 1938-03-23 | 1943-04-13 | Kallmann Hartmut Israel | Photographic plate or film for the investigation of bodies or substances by means of neutrons |
| FR878823A (en) * | 1941-02-18 | 1943-02-04 | Ig Farbenindustrie Ag | Process for emphasizing whites and the luminous power of the surface color of photographic images |
| US2303917A (en) * | 1942-04-01 | 1942-12-01 | Eastman Kodak Co | Luminescent material |
| US2639900A (en) * | 1948-12-11 | 1953-05-26 | Henry G Schaefer | Simplified space heating radiator mounted on pipe |
| GB672803A (en) * | 1949-09-16 | 1952-05-28 | Kodak Ltd | Improvements in sensitive photographic papers |
| BE502230A (en) * | 1950-04-06 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587195A (en) * | 1982-09-14 | 1986-05-06 | Konishiroku Photo Industry Co., Ltd. | Method of processing silver halide photographic light-sensitive material |
| US5043253A (en) * | 1987-12-11 | 1991-08-27 | Fuji Photo Film Co., Ltd. | Method for commonly processing two different silver halide color photographic light-sensitive materials |
Also Published As
| Publication number | Publication date |
|---|---|
| GB736123A (en) | 1955-08-31 |
| DE971467C (en) | 1959-01-29 |
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