Radiant energy – Invisible radiation responsive nonelectric signalling – Photographic type
Patent
1979-08-20
1981-02-17
Church, Craig E.
Radiant energy
Invisible radiation responsive nonelectric signalling
Photographic type
G03B 4116
Patent
active
042517320
ABSTRACT:
An improved dental intra-oral x-ray film packet holding and positioning instrument. Embodiment is of single unit construction. Two diametrically opposed film holding slots are provided for positioning all posterior exposures. Another slot is provided for positioning all anterior and bitewing positions. The slots are so designed that film is held parallel to the long axes of the teeth. An extension for alignment of the x-ray beam with the film is also incorporated in the instrument's unit construction.
REFERENCES:
patent: 2005993 (1935-06-01), Heron
patent: 3356845 (1967-12-01), Bergendal
patent: 4048506 (1977-09-01), Updegrave
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