Appeal No. 1997-2291
Application No. 08/422,667
This is an appeal from the final rejection of claims
13 through 45.
The disclosed invention relates to a display device with
at least one electron transport duct that has an inner surface
formed from an insulating material having a secondary emission
coefficient which is equal to at least one at every electron
energy level within a predetermined range of electron
energies.
Claim 13 is illustrative of the claimed invention, and it
reads as follows:
13. A display device comprising an envelope including a
surface bearing a luminescent screen having a multiplicity of
predefined areas and means for selectively energizing
respective ones of said areas to produce an image,
characterized in that said display device comprises:
a. electron emitting means;
b. at least one electron transport duct which has an
electron-receiving portion in communication with the electron
emitting means, has a plurality of output apertures, and has
an inner surface which is formed, over a substantial length of
the duct, from an insulating material having a secondary
emission coefficient which is equal to at least one at every
electron energy level within a predetermined range of electron
energies;
c. means for producing within said duct an electric
field with a predetermined field strength for effecting the
2
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