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Born on this day
Sir James Chadwick
Sir James Chadwick was an English physicist who won a Nobel Prize winner.
42nd week in year
20 October 2024

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U.S. Government patent for the photographic film14.10.1884

Wikipedia (08 Oct 2013, 14:31)
The American inventor, George Eastman, receives a U.S. Government patent on his new paper-strip photographic film.

Be it known that we, GEORGE EASTMAN and WILLIAM H. WALKER, citizens of the United States, residing at Rochester, in the county of 5 Monroe and State of New York, have jointly invented certain Improvements in Photographic Films, of which the following is a specification, reference being had to the aceompanying drawing.

Our invention relates to an improvement on the invention described in the application of George Eastman, one ot the present joint inventors, iiled in the United States Patent Office March 7, 1884:, Serial number 123,332; and it consists in coating the reverse side of the paper or other flexible support for the gelatine film with a layer or coating of gelatine, the object of this layer being to prevent the curling or twisting of the paper or other support during the various operations of developing` and fixing the iihns. le have observed in working by the process described in the said application that when the support is coated on one side only the coating swells from absorption of water during the various operations of development, and the lilms consequently manifest a tendency to curl backward, and we have ascertained by practical experience that this tendency, which is an annoyance in transferring, may be entirely overcome by giving the support a coating or layer of gelatine on its back or reverse side, and our invention consists in the process ot' preparing sensitized photographie tilmsconsisting ol" a ilexible paper or other support having a layer of gelatine on one side, and on the other a coating or layer of sensitized gelatineargentic emulsion attached to the said support by an interposed layer of relatively more 4o soluble gelatine, and it also consists in the said films themselves as a new article of mannfacture.


   
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