Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1977-02-15
1978-03-28
Borchelt, Archie R.
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
250475, 250481, G03B 4116
Patent
active
040816869
ABSTRACT:
An X-ray film cassette is formed of a pair of hinged plates, both arched inwardly about axes parallel to the hinge axis. One of the plates is formed from an inwardy curved piece of sheet metal prestressed by clamping it into an edge frame. The inside surfaces of each plate may carry X-ray intensifying screens. A method of prestressing the one plate is also disclosed.
REFERENCES:
patent: 3153145 (1964-10-01), Yerkovich
patent: 3958125 (1976-05-01), Zechmair et al.
patent: 4032790 (1977-06-01), Nakamura
Borchelt Archie R.
E. I. Du Pont de Nemours and Company
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