US853643A - Photographic paper. - Google Patents

Photographic paper. Download PDF

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Publication number
US853643A
US853643A US31702806A US1906317028A US853643A US 853643 A US853643 A US 853643A US 31702806 A US31702806 A US 31702806A US 1906317028 A US1906317028 A US 1906317028A US 853643 A US853643 A US 853643A
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United States
Prior art keywords
photographic paper
emulsion
acid
lumiere
excess
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Expired - Lifetime
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US31702806A
Inventor
Auguste Lumiere
Louis Lumiere
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Individual
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Priority to US31702806A priority Critical patent/US853643A/en
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Publication of US853643A publication Critical patent/US853643A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/42Developers or their precursors

Definitions

  • the invention has for its object the preparation of silver salt photographic papers containing an excess of soluble silver salt and e of development by simple immersion in water.
  • silver salt papers containing an excess of salt such as papers prepared with citrate of silver
  • a developer such ashydroquinone, gallic. acid, or other developing sub stance, in acid solution for example, .which, V by actingupon the excess of soluble silver salts of the paper,. produces-reduced silver which gradually fixes on the image the impression of which the action of light.

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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)
  • Paper (AREA)

Description

capab NI D STATES. PATENT .OFFIOE.
AUGUSTE LUMIERE AND LOUIS LUMIERE, OF LYONMONPLAISIR, FRANCE.
PHYQTQGRAPHIC PAPER;
Speeifi'cation of Letters Patent.
Patented May 14, 1907.
' Application filed May 15. 1906. Serial No. 317,028.
To all 1421mm it may concern:
Be it known that we, AUGUs'rE LUMIiaRE and LOUIS LUMIERE, citizens of France, residing at Lyon-Monplaisir, France, have invented new and useful Improvements in Photographic Papers, of which the following is a specification.
The invention has for its object the preparation of silver salt photographic papers containing an excess of soluble silver salt and e of development by simple immersion in water.
It is knownthat silver salt papers containing an excess of salt, such as papers prepared with citrate of silver, can be slightly impressioned and then treated with a developer, such ashydroquinone, gallic. acid, or other developing sub stance, in acid solution for example, .which, V by actingupon the excess of soluble silver salts of the paper,. produces-reduced silver which gradually fixes on the image the impression of which the action of light.
Hitherto it has not been possible to introduce directly the developing substance. into the emulsion 'used in the preparation of photographic papers in order to permit of the development of the image by simple immersion in water; the addition ofa developing substance to the emulsion promotes in fact, at the end of a very short time, the reduction of the solublesilver salt. In carrying the inhas been commenced by photographic soluble silver vention into effect this inconvenience is remedied by the addition of sulfurcus acid either to the emulsion or to the developing substance which is added to it."
The following is an example of how one can proc red in the latter case by employing gallic aciil.
Make a twentyper cent alcoholic solution of gallic acid and introduce into it tencubic centimeters of liquid sulfurous acid for every one hundred cubic centimeters of solution. Add in the dark fifty cubic centimeters of this solution to every one hundred cubic centimeters of citrate emulsion. The emulsion thus obtained can be readily prepared and spread without incurring any darkening.
The above mentioned quantities can be modified Within large proportions. and they have only been. cited by way of example. I
What we claim as our invention and desire to secure by Letters Patent, is z- I The herein described article, consisting of an emulsion containing an excess of soluble silver salt, a developer and sulfurous acid.-
In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.
AUGUSTE LUMIERE. LOUIS LUMIERE.
Witnesses: I GASTON JEAUNIAUX, P MARIN VACHON.
US31702806A 1906-05-15 1906-05-15 Photographic paper. Expired - Lifetime US853643A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US31702806A US853643A (en) 1906-05-15 1906-05-15 Photographic paper.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US31702806A US853643A (en) 1906-05-15 1906-05-15 Photographic paper.

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US853643A true US853643A (en) 1907-05-14

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US31702806A Expired - Lifetime US853643A (en) 1906-05-15 1906-05-15 Photographic paper.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572357A (en) * 1945-07-13 1951-10-23 Polaroid Corp Photographic product comprising a fluid processing agent and apparatus for use in connection therewith
US3010827A (en) * 1956-12-22 1961-11-28 Agfa Ag Photographic developer
US3457079A (en) * 1964-12-30 1969-07-22 Konishiroku Photo Ind Photographic silver halide emulsions stabilized with gallic acid or an alkyl ester thereof
US3751255A (en) * 1972-03-24 1973-08-07 Eastman Kodak Co Photosensitive and thermosensitive element, composition and process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572357A (en) * 1945-07-13 1951-10-23 Polaroid Corp Photographic product comprising a fluid processing agent and apparatus for use in connection therewith
US3010827A (en) * 1956-12-22 1961-11-28 Agfa Ag Photographic developer
US3457079A (en) * 1964-12-30 1969-07-22 Konishiroku Photo Ind Photographic silver halide emulsions stabilized with gallic acid or an alkyl ester thereof
US3751255A (en) * 1972-03-24 1973-08-07 Eastman Kodak Co Photosensitive and thermosensitive element, composition and process

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