US2422080A - Photographic emulsions containing supersensitizing dye combinations - Google Patents
Photographic emulsions containing supersensitizing dye combinations Download PDFInfo
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- US2422080A US2422080A US566822A US56682244A US2422080A US 2422080 A US2422080 A US 2422080A US 566822 A US566822 A US 566822A US 56682244 A US56682244 A US 56682244A US 2422080 A US2422080 A US 2422080A
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- emulsion
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- 239000000839 emulsion Substances 0.000 title description 31
- 239000000975 dye Substances 0.000 description 19
- 125000000217 alkyl group Chemical group 0.000 description 16
- 230000035945 sensitivity Effects 0.000 description 13
- 239000004332 silver Substances 0.000 description 12
- 229910052709 silver Inorganic materials 0.000 description 12
- 125000003710 aryl alkyl group Chemical group 0.000 description 8
- 230000001235 sensitizing effect Effects 0.000 description 8
- -1 silver halide Chemical class 0.000 description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical group [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Natural products CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 125000003367 polycyclic group Chemical group 0.000 description 2
- 125000003748 selenium group Chemical group *[Se]* 0.000 description 2
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- 101100379079 Emericella variicolor andA gene Proteins 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 238000012550 audit Methods 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001752 chlorophylls and chlorophyllins Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Substances O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- ZUNKMNLKJXRCDM-UHFFFAOYSA-N silver bromoiodide Chemical compound [Ag].IBr ZUNKMNLKJXRCDM-UHFFFAOYSA-N 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/08—Sensitivity-increasing substances
- G03C1/28—Sensitivity-increasing substances together with supersensitising substances
- G03C1/29—Sensitivity-increasing substances together with supersensitising substances the supersensitising mixture being solely composed of dyes ; Combination of dyes, even if the supersensitising effect is not explicitly disclosed
Definitions
- This invention ⁇ relates to photographic materals and particularly to themanufactureof vdyesensitised .photographic silver halide emulsqrl ,Rhotographic silver .halide Iemulsions have a certain natural sensitivity to light', ybut*l this ⁇ is restricted to a short range of wavelengths in vthe ultra-violet .and/or blue regions of the spectrum. 'lhe-.elet ⁇ r0f incorporating a Sensitisine dye iS to impart vto the .emulsion .sensitivity .to light of other wavelengths.
- AIt has .been ,knownforsome time ,that .the .eieot of incorporating two prmore sensitisng dyes in' thefemulsion .isngt valways the simple sum of their individual effects, and sometimes ,an .additional sensitivity itsxobtained Qombinations of dyes whichgive thislatterresult are known as supersensitising combinations.
- the present invention is concerned with supersensitising combinations of dyestuffs.
- photographic silver halide emulsions are supersensitised by incorporating in the emulsion a combination of a sensitising dyestuff of the general formula I.
- RifRa'Ra'Rs andjRs arethe-same orditferent and are alkyl or aralkyl-g-roups orisu-b'stituted groups of this type
- yR4 and Rmarelithesame or diierent are ⁇ hydrogen atoms or alkyl or aralkyl groups
- R groups are alkyl radiales
- the R groups, or :any .of-them .are aralkyl radcles lthey may be, Afor example, .benzyl .or ,fnaphthrlmethyl A.raf-icles- :substituted,alkyhradicles which may he present, e. Le. asr aria' R1, R2, R5 and .136, may flO-e ,hy-
- .inddenines ⁇ da such .as .pyrimidines ⁇ and .Quineolns CllZQlES (e. g. thio-.diazole), oiga; vings, ,thiahz'qlines and selenazolines.
- the polycyclic compoundsfof this series may also ,be substituted in the car- 13.905 Clic Tng With 011.5 911mm? .g'OllPs .Such as alkyl, aryl, tillllp, ,hYET0XY,.21 k0XY 31,1@- methyleee-.dioxv swims.
- Dyestuffs of the general formula 5I, and their preparaten, aresiestrihedin Britishpatentspecification No. 553,144 land corresponding ⁇ 'lllriitei States entlsst@ 'eris11fNumber 4611,3241391 October 195i?. .Dyestuis of the gener-alformu-lall are wellknown and may be synthesised by any ofthe-knownjmethods.
- Fig. 1 shows thespectral Y sensitivity curve of the emulsionof Example laV .('full line) and 1b (dotted line)
- Fig. 2' shows the -spectral sensitivity curve of the emulsion of EX- ample 6a- (full line) and 6b (dotted line)
- Fig. 3 shows the -spectral sensitivity curve of the emulsion of EX- ample 6a- (full line) and 6b (dotted line)
- thev red speed of the emulsion may be determined and this, in
- R1, Rz, R3, Rs and Re are each selected from the group consisting of alkyl and aralkyl groups
- R4 and R1 are each selected from the group consisting of the hydrogen atom and alkyl and aralkyl groups
- Z1, Z2, Z3 and Z4 are selected from the group consisting of oxygen, sulphur and selenium atoms
- M1, M2, M3 and M4 are residues completing azole nuclei.
- R1, R2, R3, R5 and Re are each lower alkyl groups
- R4 and R1 are selected from the group consisting of hydrogen and alkyl and aralkyl groups
- Z1, Z2, Z3 and Z4 are each selected from the group consisting of oxygen, sulphur and selenium atoms.
- R1, R2, R3, R5 and Re are lower alkyl groups
- R4 and R1 are selected from the group consisting of hydrogen and alkyl and aralkyl groups.
- R1, R2, Ra, R5 and Re are lower alkyl groups
- R7 is selected from the group consisting of hydrogen and alkyl and aralkyl groups.
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
June 10, 1947.- R. B. COLLINS ET AL ,2,422,080
PHOTOGRAPHIC EMULSIONS CONTAINING SUPERSENSITIZING DYE COMBINATIONS Filed Dec. e, 1944 Rolafzdezwaz'd jlilzs Harald welzz'c'i/zso/z INVENToRs l BY l VMM, Ra/*vuoti* 7,7m
Patented June 10, 1947 Pnoroenarino sMULsIons GaN-MINING SiJBEnsENSIHZm G DYE ',LGQlYlBINMIONS Ronald Bernard Collins and `Harold Owen Dickinson, Ilford, England, assigjnors to Ilford Limited, Ilford, Enig-land, a British company Applicaation`theoeinher 6, 194.4SerialNa 566,822 In .Great Britain Decemberfs, 19.43
7 Claims.
This invention `relates to photographic materals and particularly to themanufactureof vdyesensitised .photographic silver halide emulsqrl ,Rhotographic silver .halide Iemulsions have a certain natural sensitivity to light', ybut*l this `is restricted to a short range of wavelengths in vthe ultra-violet .and/or blue regions of the spectrum. 'lhe-.elet `r0f incorporating a Sensitisine dye iS to impart vto the .emulsion .sensitivity .to light of other wavelengths. AIt has .been ,knownforsome time ,that .the .eieot of incorporating two prmore sensitisng dyes in' thefemulsion .isngt valways the simple sum of their individual effects, and sometimes ,an .additional sensitivity itsxobtained Qombinations of dyes whichgive thislatterresult are known as supersensitising combinations.
The present invention is concerned with supersensitising combinations of dyestuffs. According to the invention, photographic silver halide emulsions are supersensitised by incorporating in the emulsion a combination of a sensitising dyestuff of the general formula I.
whereRifRa'Ra'Rs andjRs arethe-same orditferent and are alkyl or aralkyl-g-roups orisu-b'stituted groups of this type, yR4 and Rmarelithesame or diierent and are `hydrogen atoms or alkyl or aralkyl groups, I13g-D2', De. yand =D4 are `the same or different and are residues of heterocyclionitrogen nuclei of the type kcommon in .cyanine dyesand X i and Y areI the same or different and are acidradicles and n is 0 or 1.
In cases where the R groups, or any of them, are alkyl radiales, these .are preferably lower alkyl -rad-c1es, i. .e. containing not A,more than 4 carbon atoms, Ae. g. methyl, ethyl, or hydroxy ethyl radiales, though they may be higher alkyl radicles. In cases where the R groups, or :any .of-them .are aralkyl radcles, lthey may be, Afor example, .benzyl .or ,fnaphthrlmethyl A.raf-icles- :substituted,alkyhradicles which may he present, e. Le. asr envoi' R1, R2, R5 and .136, may flO-e ,hy-
, droxy;alkyl radicles.
mhezresduesiDtIDaDa andDemay-.rbezselsted drom :the 'residues yof-f-i'fhazoles,. Qxazoles, ,selenazoles and their polycyclic Vhoinologues,vsiiollnas those .er rthe benzene, ,naphtilaleneecnerzlitlleae andanthracene series .pyridine audits ,PQlYPyQlie homologues. anchas elflinqlne and e erlldnalihihaquinqlines `lepdifnes. .inddenines `da such .as .pyrimidines `and .Quineolns CllZQlES (e. g. thio-.diazole), oiga; vings, ,thiahz'qlines and selenazolines. The polycyclic compoundsfof this series may also ,be substituted in the car- 13.905 Clic Tng With 011.5 911mm? .g'OllPs .Such as alkyl, aryl, tillllp, ,hYET0XY,.21 k0XY 31,1@- methyleee-.dioxv swims. .er :by belegen atoms- Theacidl radiales .X .and .Y ,maybe for exemple, selected .from halogenide radiclea e. g. chloride, @melide ...and .iQdida er alkyl Sulphate alkyl P'- toluene Sulrheate .0r perchlorate.
Dyestuffs of the general formula 5I, and their preparaten, aresiestrihedin Britishpatentspecification No. 553,144 land corresponding `'lllriitei States entlsst@ 'eris11fNumber 4611,3241391 October 195i?. .Dyestuis of the gener-alformu-lall are wellknown and may be synthesised by any ofthe-knownjmethods.
The following are examples of specific -dyestuis which maybe employed, the dyestu-fls being .lettered to facilitate rsubsequent reference:
Dyestus of general formula I iodide.
H. a2 `1 .9Y trmethyl thiaquinodicarbocyanine iodide- I. 53.3;9,12; ;tetrarnethyl -gthiadiarbooyanine mite.
vDyestws of v general Aformula [I1-I ,Aanine chloride.
,S- 3!fdiethylzthiacarbocvanne iodide.
,'ieciciycmsyetny1 femenin- .tratareportions equivalent to to 50 cc. of a 1 in 2000 Y' solution of the dyestui per litre of emulsion 'are suitable. The dyestuffs are preferably incorporated in the emulsion during the manufacture of the emulsion. t Y The Yfollowing examples illustrateY the invention. In these examples the emulsions containing the dyes were tested for speed to daylightandto A The dyestuifs of general formula red" light. II, when used alone, do not impart any sensitivity Y 4 Y sion as shown by the generally increased daylight speed. Y Y
This general eiect is illustrated in the accom panying drawings which show spectral sensitivity curves for the emulsions of certain ofthe foregoing examples.
In these drawings, Fig. 1 shows thespectral Y sensitivity curve of the emulsionof Example laV .('full line) and 1b (dotted line), Fig. 2'shows the -spectral sensitivity curve of the emulsion of EX- ample 6a- (full line) and 6b (dotted line), Fig. 3
j shows the spectral sensitivity curve of the em'ul tothe emulsion at wavelengths above'680 my,
so that by exposing the supersensitised emulsion through a kilter which cuts ofi' allradiation of wavelengthsk less thanY 680V mp, thev red speed of the emulsion may be determined and this, in
comparison with an emulsion'containingV only aY dyelof -general formulaI, affords a measure of the supersenstising effect.
` Examples V VIn these examples the dyestuffs employed are referred to by the lettering given above. .'Ihe combinations of dyestus-were incorporatedjin 'a gelatin silver iodobromide emulsion con-taining about 6.5 gms. of silver halidev (icalculatedas silver)VV per litre of emulsion, during the manufacture of the emulsion, and the resulting emulsion was coatedY on glass and its speed determined to daylight and also to red light,v i. e.- of wavelengths above 680 mp.. Y The resultsfobtained are set out in the following'table (in which the quantities of dyestuff are given as ccs. of a 1 in 2000 solution Vof the dyestuff added per litre of emulsion) K 1 i I Quantity Quantity j Exam- FDglfa of Dye of Flgfa of dye of 9g.; Red ple No. or Formula Y Formula f 1g Speed l Y I .II II Speed A .1.40, 2.0 'A 250 64 'A 150 32 B Y. 100` 18 B 200 34 B Y 89 14 B 150A 25 E 140 2. 1 E 240 9.' 7 C `250 42 C 470 Y 89 C 74 l2 o 26ol 45 C 10o 21 C` 270 45 Y D 74 2.8 D 170 27 Y D 27o sa e of the dicarbocyanine dye,l but actually effectV an increasey in the overall sensitivity of the `emulsionY of VExample/9a, (ullline) and V9b (dotted line), Fig. 4V shows-the spectral sensitivity curve of the emulsion of Example .3a (full line) and 3b (dottedline), Fig. 5 shows the spectral sensitivity curve of the emulsion of Example la (full line)` vand 4b (dotted line), and Fig. 6 shows the spec-V tral sensitivity curve of the emulsion of Example 5cl-(full line) and 5b (dotted line) YTliedyesof Ygeneral formula'QII, used inthe foregoing examples do not, whenused alone,` impartV anyv sensitivity to the emulsion over-Wavelengths longer thank 680mg so thatV the 4curves Clearly demonstrate the Vsupersensitising' e'ect 'obtainedv Y -While this Vinvention is of particular ValueV in connection "with the supersensitising of silver halide emulsions in gelatin, other bindingrrcolloids for Ythe emulsion fmay be employed, K for-example polyvinyl alcohol, polyvinyl acetals, far-hydro lysed cellulose esters and the like. V What we claim is: 1. vA photographic silver halidefemulsion con- 27; A photographic silver halide emulsion,r4 coni taining bothV a ysensitising dyestuff offrthe'zforwhererR1, L12.2.7523, RsV and ReY are eachjseleeted fromY the group consisting of alkyland'k aralkyl groups, R4 and Bn lare Yeach selected from Vthe group consisting of the hydrogen atom and alkyl andraralkyl groups, D1, D2, DaanduDilarerresi'- Vrdues of-azo1e nuclei,- andA X`an'dA Yjare. .acid
radi/,cles andv isa-number taken` from the group consistingofand 1.? u
3. A photographic silver halide emulsion containing both a sensitising dyestuft of the formula:
where R1, Rz, R3, Rs and Re are each selected from the group consisting of alkyl and aralkyl groups, R4 and R1 are each selected from the group consisting of the hydrogen atom and alkyl and aralkyl groups, Z1, Z2, Z3 and Z4 are selected from the group consisting of oxygen, sulphur and selenium atoms, and M1, M2, M3 and M4 are residues completing azole nuclei.
4. A photographic silver halide emulsion containing both a sensitising dyestuff of the formula:
^ where R1, R2, R3, R5 and Re are each selected and a sensitising dye of the formula:
where R1, R2, R3, R5 and Re are each lower alkyl groups, R4 and R1 are selected from the group consisting of hydrogen and alkyl and aralkyl groups, and Z1, Z2, Z3 and Z4 are each selected from the group consisting of oxygen, sulphur and selenium atoms.
6. A photographic silver halide emulsion containing both a sensitising dye of the formula:
and a sensitising dye of the formula:
Where R1, R2, R3, R5 and Re are lower alkyl groups, and R4 and R1 are selected from the group consisting of hydrogen and alkyl and aralkyl groups.
'7. A photographe silver halide emulsion containing both a sensitising dye of the formula:
S Ra and a sensitising dye of the formula:
C=Cn- \N/ N n, R/ \Y where R1, R2, Ra, R5 and Re are lower alkyl groups, and R7 is selected from the group consisting of hydrogen and alkyl and aralkyl groups.
RONALD BERNARD COLLINS. HAROLD OWEN DICKINSON.
REFERENCES CITED The ollowing references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,075,048 Mees Mar. 30, 1937 2,104,064 Zeh Jan. 4, 1938
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2422080X | 1943-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2422080A true US2422080A (en) | 1947-06-10 |
Family
ID=10906475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US566822A Expired - Lifetime US2422080A (en) | 1943-12-08 | 1944-12-06 | Photographic emulsions containing supersensitizing dye combinations |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2422080A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2950196A (en) * | 1955-10-12 | 1960-08-23 | Eastman Kodak Co | Supersensitization of photographic emulsions using triazines |
| US3522052A (en) * | 1965-11-06 | 1970-07-28 | Fuji Photo Film Co Ltd | Photographic supersensitized silver halide emulsions |
| US3527641A (en) * | 1965-10-22 | 1970-09-08 | Fuji Photo Film Co Ltd | Supersensitized photographic silver halide emulsion |
| US3617294A (en) * | 1968-09-09 | 1971-11-02 | Fuji Photo Film Co Ltd | Spectrally sensitized silver halide photographic emulsion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2075048A (en) * | 1932-11-04 | 1937-03-30 | Eastman Kodak Co | Photographic emulsion containing supersensitized carbocyanines |
| US2104064A (en) * | 1931-07-28 | 1938-01-04 | Agfa Ansco Corp | Sensitizing of silver-halide emulsions |
-
1944
- 1944-12-06 US US566822A patent/US2422080A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2104064A (en) * | 1931-07-28 | 1938-01-04 | Agfa Ansco Corp | Sensitizing of silver-halide emulsions |
| US2075048A (en) * | 1932-11-04 | 1937-03-30 | Eastman Kodak Co | Photographic emulsion containing supersensitized carbocyanines |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2950196A (en) * | 1955-10-12 | 1960-08-23 | Eastman Kodak Co | Supersensitization of photographic emulsions using triazines |
| US3527641A (en) * | 1965-10-22 | 1970-09-08 | Fuji Photo Film Co Ltd | Supersensitized photographic silver halide emulsion |
| US3522052A (en) * | 1965-11-06 | 1970-07-28 | Fuji Photo Film Co Ltd | Photographic supersensitized silver halide emulsions |
| US3617294A (en) * | 1968-09-09 | 1971-11-02 | Fuji Photo Film Co Ltd | Spectrally sensitized silver halide photographic emulsion |
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