US760585A - Positive stripping-film for photographs. - Google Patents

Description

v UNTTED- STATEs Patented May 24, 1904.

"PATENT OFFICE.

JOHN E. THORNTON AND. CHARLES E.- s. ROTHWELL, OE MANOHEsTER,

ENGLAND. l

I T a/ZZ whom it may concern,.-

black, colored, or ,opaque paper 4base A and apply or spread over the surface of the'same PoslTlvEsTmPPl'Ne-FILM Fon PHOTOGRAPHS.

Y SPECIFIGAT-IONl forming part of Letters' Appiication finti Miirch'zo, 190el Be it known that we, JOHN EDWARD THORN- TON and CHARLESFREDERIOK SEYMOUR ROTH- WELL, British subjects, residing'at Manchester, in the county of Lancaster, England, have invented certain new and useful Improvements in Positive Stripping-Films for Photographs, of which the following is a specification.

This invention relates to improvements in the production of direct positive photographs, (such as described in the specification of our earlier patent, No.64=7,540.) Hitherto in the production of such direct positive photographs there has been used a sensitive gelatino-bromid emulsion coated very thinly upon a base of opaque, black, or colored paper. After eX- posure the film is developed, fixed, whitened, washed, and dried, yielding a positive image, as seen by reflected light. This -image is reversed as regards right and left unless a reversing prism or mirror is used.

' By this invention non-reversed or correctpositive pictures can beobtained'.

' It consists, essentially, of a photographic sensitive film, capable of being stripped from its base, mounted upon abaseof black lor colored paper, from which it can be readily removed and reattached to the sameor another black -or colored paper with the reverse side to the paper after having been developed, fixed, and whitened.. f

Figure lis a sectional view showing the sensitive film. Fig. 2 is a sectional View showing the lilm being reversed by stripping from its original backing.

In carrying' out the invention we take a a suitable/stripping medium B and over that the sensitive emulsion C. The stripping medium may be rubber or collodion applied on a waterproof surface; but we prefer the material formed by dissolving and drying the This preparation renders the black or colored paper base waterproof and serves the important -doulole purpose of causing the film to adhere to the paper base during all the various operations and yet enables itv to 'be readily stripped therefrom when .the linished picture Patent No. veossjaated May 24, 1964.

Serial No. 9,464. (No specimens.)

scribed above is exposed in the camera, de- `veloped, fixed, Whitened, and washed. When the washing is complete, a piece of black or colored paper E, previously coated with gelatin, gum, or other suitable adhesive substance F, is pressed into contact with the face C of the picture and the whole allowed to become quite dry. The picture is completed by merely pulling the two pieces apart when the picture attaches itself to the adhesive black or colored paper and is consequently reversed during this operation.

The film may be first stripped from the black or colored paper base and then the reverse sideapplied and caused to adhere to the same or to` another black or colored paper base. The `result is the finished picture.

The whole operations present no special difliculties and the picture is obtained direct with the minimum of trouble and Without the intervention of negative-making and printmaking processes.

That we claim as our invention, and desire to protect by Letters Patent, is-

l. A photographic film comprising in its construction a dark colored paper base, a stripping' medium applied to the surface of the paper base, a layer of a reinforcing medium to support the image applied over the stripping medium, and sensitive emulsion applied over the reinforcing medium forming a thick layer capable of being removed from the colwith a layer of reinforcing medium to support --the image, and a layer of sensitive emulsion thereon, anda base of dark-colored paper, of a stripping medium interposed between the reinforcing medium and the base, substantially as described.

3. In a photographic film the combination IOO with a layer of a reinforcing medium to support the image, and a layer of sensitive emulsion thereon, and a base of dark-colored paper, -of a stripping medium interposed between the reinforcing medium and the base, and a second piece o'f dark paper E coated with an adhesive coating to be applied to the face of the sensitive layer, substantially as described.

4. In a photographic film the combination with a dark-colored paper base, and a stripping medium comprising a salt of a fatty acid dissolved and dried applied to the surface thereof, of a layer of a reinforcing medium applied over the stripping medium, and a layer of sensitive emulsion adhering to the 'reinforcing medium substantially as de- With a darli-colored paper base and a stripping medium of a salt of a fatty acid dissolved and dried applied to the surface of said base, of a layer of a reinforcing medium applied over the stripping medium, a layer of sensitive emulsion adhering to the reinforcingmedium, and a second piece of dark paper E to be affixed to the face of the sensitive layer, substantially as described.

In Witness whereof Wehavchereunto signed our names in the presence of two subscribing Witnesses.v

J. E. THORNTON. C. F. S. ROTHYVELL.

Witnesses: i

J. OWDEN OBRIEN, HARRY BARUFATHER.

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