# US 4,399,363 A · Means for converting X-rays into radiation which darkens X-ray films

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- Number: US 4,399,363 A
- Document ID: US4399363A
- Status: Granted
- Kind: A
- Application number: 06/199,377
- Filed: 1980-10-21
- Granted: 1983-08-16
- Earliest claimed: 1979-10-30
- Assignees: Agfa-Gevaert
- Inventors: Walter Bauer
- Web page: https://patentgrep.com/patent/US4399363A

## CPC

- G03C 5/17: using screens to intensify X-ray images (X-ray conversion screens G21K4/00)
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)

## Abstract

A laminate for conversion of X-rays into radiation that darkens X-ray films has a flexible plate which is disposed between a fluorescent layer and a ferromagnetic layer. The latter enables the plate and the fluorescent layer to bear against an X-ray film in a cassette or at an exposure station for X-ray films by being attracted to a plate-like permanent magnet. The ferromagnetic layer is permanently bonded to the respective side of the flexible plate or is simply confined between the plate and an outer layer which is permeable to X-rays and whose marginal portions extend beyond the ferromagnetic layer and are bonded to the respective marginal portions of the plate. Alternatively, the ferromagnetic layer can be inserted into a sealable envelope or bag which is bonded to the respective side of the plate, namely, to that side of the plate which faces away from the fluorescent layer.

## Claims

### Claim 1

A flexible laminate for conversion of X-rays into radiation which effects darkening of X-ray film, comprising a flexible plate; a fluorescent layer at one side of said plate; a receptacle adjacent to the other side of and secured to said plate; and a flexible ferromagnetic layer in said receptacle.

### Claim 2 (depends on 1)

The laminate of claim 1, wherein said receptacle is an envelope.

### Claim 3 (depends on 1)

The laminate of claim 1, wherein said receptacle is a bag.

### Claim 4 (depends on 1)

The laminate of claim 1, wherein said receptacle has a sealable opening for insertion or removal of said ferromagnetic layer.

### Claim 5 (depends on 4)

The laminate of claim 4, wherein said receptacle has several marginal portions and said opening extends along one of said marginal portions.

### Claim 6 (depends on 4)

The laminate of claim 4, wherein said receptacle has means for sealing said opening.