The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 1987
Filed:
Jul. 10, 1986
Kazuyuki Yoshimura, Kanagawa, JP;
Yoshio Sakakibara, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A peel-apart instant film unit including two separate sheets comprising a photosensitive sheet and an image-receiving sheet, has a coloring member provided on one end of the photosensitive sheet so as to contact a developer reagent spread between the two sheets for processing. The coloring member is adapted to change in color upon the completion of the processing of the film unit as a result of the chemical reaction of the coloring member brought into contact with the developer reagent. The color change of the coloring member, which is observed from the outside of the film unit, indicates the completion of the processing of the film unit. The coloring member includes a time delay substance that initially separates the reagent spread between the sheets, from the substance that changes color. That time delay substance is permeable by the reagent at a rate such that the reagent reaches that substance and causes the color change only upon the completion of the development of the film unit.