Appeal 2007-0835
Application 09/950,778
B. Facts
Yamane is directed to a radiographic intensifying screen including a
support, a phosphor layer, and a protective layer (Yamane, col. 2, ll. 4-7).
The protective layer contains light-scattering fine particles, preferably
particles of titanium dioxide (Yamane, col. 4, ll. 27-44). The background of
the invention section of Yamane discloses several prior art references that
disclose roughened surfaces (Yamane, col. 1, ll. 29-41). The binder
employable in the surface protective layer is not restricted, but is selected to
provide surface durability (Yamane, col. 4, ll. 45-49). The object is to
obtain a screen with good surface durability which gives a radiation image
of high sharpness with high sensitivity (Yamane, col. 1, l. 66 to col. 2, l. 3).
In preparation for use in a radiographic process, the radiographic X-ray film
is placed in contact with a screen or in-between two screens (Yamane, col. 1,
ll. 7-9; col. 5, ll. 38-42; col. 6, ll. 50-56; col. 8, ll. 47-51).
Van Havenbergh is also directed to a screen including a phosphor
element with a protective coating used in radiography systems (Van
Havenbergh, col. 1, ll. 7-18). Van Havenbergh suggests the use of urethane
acrylates in the abrasion-resistant protective coating overlaying the phosphor
layer (Van Havenbergh, col. 5, l. 45 to col. 6, l. 22).
Van Landeghem is directed to an X-ray film cassette in which air
pockets are eliminated between a reinforcing foil and an X-ray film within
the cassette (Van Landeghem, col. 1, ll. 36-39). The surface of the
reinforcing foil facing the film has a roughness of between 10 and 60
microns (Van Landeghem, col. 1, ll. 45-47). The roughness allows air to
flow out during loading and unloading of the X-ray film from the cassette so
that air pockets are eliminated on loading and sticking reduced on unloading
5
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: September 9, 2013