# US 4,394,772 A · Radiographic cassette

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- Number: US 4,394,772 A
- Document ID: US4394772A
- Status: Granted
- Kind: A
- Application number: 06/326,839
- Filed: 1981-12-03
- Granted: 1983-07-19
- Earliest claimed: 1981-10-06
- Assignees: Okamoto Manufacturing Co., Ltd.
- Inventors: Tadaomi Okamoto; Masayuki Ohta; Makoto Watanabe
- Web page: https://patentgrep.com/patent/US4394772A

## CPC

- G03B 42/04: Holders for X-ray films
- G03B 2206/00: Systems for exchange of information between different pieces of apparatus, e.g. for exchanging trimming information, for photo finishing
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A radiographic cassette comprises a film-receiving plate and a film-keeping plate engageable with the film-receiving plate. The cassette is further provided with an external indicator which enables an operator to visually check whether or not the cassette has been loaded with a film.

## Claims

### Claim 1

A radiographic cassette comprising a film-receiving plate and a film-keeping plate engageable with said film-receiving plate in light-tight relation to press a film against said film-receiving plate, in which said film-keeping plate is provided with a solar battery and a liquid crystal indicator adapted to be actuated by currents therefrom, both being open to view, and provided on its inner surface with a pair of conductive planes isolated from each other and connected to said battery, and said film-receiving plate is provided on an associated position of its inner surface with a conductive plate which is adapted to come in contact with said conductive planes to cause shorting.