US732189A - Solution for use in the production of photographic papers, plates, &c. - Google Patents

Description

UNITED STATES Patented June 30, 1903.

PATENT OFFICE.

MAX J OLLES AND LEON LILIENFELD, OF VIENNA, AUSTRIA-HUNGARY.

SPECIFICATION forming part of Letters Patent No. 732,189, dated June 30, 1903.

Application filed June 30, 1897. Serial No. 643,022. (No specimens.)

To aZZ whom it may concern:

Beit known that we, MAX Jonas and LEON LILIENFELD, citizens of the Empire of Austria-Hungary, and both residents of Vienna, in the Empire of Austria-Hungary, have invented a certain new and useful Improved Solution for Use in the Production of Photographic Paper, Plates, &c., of which the following is a full, clear, and exact description.

This invention has for its object to provide an improved solution for use in the production of photographic paper, plates, &c., and in producing said solution we use albuminous substances of grain soluble in alcohol, such as vegetable fibrin, mucedin, gliadin, and the like, each by itself or mixed together or in connection with albumen, gelatin, collodion, or other ingredients suitable for photographic purposes. The albuminous substances are used in alcohol solution and may be deposited upon the paper either suitably salted and afterward sensitized, or the substances sensitive to light may beemulsified in the solution of albuminous substances in the following manner: The albuminous sub stance is dissolved in alcohol, salted in the usual way with a haloid, and a solution of silver salt in a thin steam afterward added thereto, whereby the silver haloid salt produced will be uniformly emulsified. The addition of an organic acid and that of a substance which makes the paper pliantsuch as glycerin,castor-oil, and the likeis desirable. The method described may be used cold or warm, the order of the additions may be varied at will, and the finished emulsion is used for the production of the plates, paper, or diapositive in the usual manner. The paper thus produced besides being brought into the market completely ready for use and remaining good for months has the advantage of being highly sensitive, superseding in this respect albumen-paper and being equal to the best collodion-paper. The picture produced on the paper or plates will not change even if strongly exposed to the sun, retains the white parts perfectly pure, and is not liable to turn yellow.

Compared with the papers hitherto known, particularly with the collodion-papers, our improved paper has the advantage that the film, which is sensitive to light, cannot be easily scratched, and compared with the gelatin-paper that the same even at a high temperature will not blister in the bath. The improved paper permits also of being treated in the bath in quantities, as the same is not liable to roll or otherwise change undesirably. The treatment of the paper is most simple, as the same can be toned 0d rapidly and properly in any bath without having to prepare the bath specially, as is the case when using other emulsion-papers, and the consumption of gold is very small. The paper requires also no special attention in the toning-bath, as it can be exceedingly easily toned off and fixed. The pictures obtained after the toning off and fixing are extraordinarily sharp. The dark parts show extraordinary beauty, and the light parts are particularly clear.

We claim 1. A solution for the preparation of sensitive photographic surfaces, consisting of an alcoholic solution of the albuminous substances of grain, said solution containing a haloid salt.

2. A solution for the preparation of sensitive photographic surfaces, consisting of an alcoholic solution of the albuminous substances of grain, said solution containing a silver haloid salt.

In witness whereof we have hereunto set our hands in presence of two witnesses.

MAX J OLLES.

LEON LTLIENFELD.

Witnesses:

HARRY BELMONT, KARL I-IiiTTER.