Appeal No. 1997-3884
Application No. 08/712,240
APPENDIX
15. A method of producing a ceramic sheet, comprising the steps of:
(a) preparing a ceramic green sheet slurry containing ionic
species, polyvinylbutyral, and a ceramic particulate consisting essentially
of alumina and being devoid of boron species and phosphorus species,
wherein said ionic species are selected from the group consisting of boron
compounds in their ionic form, and phosphorus compounds in their ionic
form; [emphasis added]
(b) dispersing said slurry on a substrate;
(c) allowing said dispersed slurry to set providing a ceramic green
sheet with controlled microporosity; and then
(d) sintering said set slurry to produce a ceramic sheet.
21. A method of producing a ceramic sheet, comprising the steps of:
preparing a ceramic green sheet slurry containing polyvinylbutyral,
ceramic particulate consisting essentially of alumina and being devoid of
boron species and phosphorus species, and a solvent system;
adding ionic species to said ceramic green sheet slurry, wherein
said ionic species are selected from the group consisting of boron
compounds in their ionic form, and phosphorus compounds in their ionic
form;
casting said ceramic green sheet slurry;
allowing said ceramic green sheet slurry to set to provide a green
sheet having controlled microporosity, wherein a time for setting of said
ceramic green sheet slurry with said ionic species is faster than for said
ceramic green sheet slurry when devoid of said ionic species; and
sintering said ceramic green sheet slurry to produce a ceramic
sheet.
35. A method of producing a multilayered ceramic structure from ceramic
green sheets of controlled microporosity and compressibility, comprising
the steps of:
preparing a ceramic green sheet slurry containing polyvinylbutyral,
ceramic particulate consisting essentially of alumina and being devoid of
boron species and phosphorus species, and a solvent system;
adding ionic species to said ceramic green sheet slurry, wherein
said ionic species are selected from the group consisting of boron
compounds in their ionic form, and phosphorus compounds in their ionic
form;
casting said ceramic green sheet slurry;
allowing said ceramic green sheet slurry to set to provide a green
sheet having controlled microporosity, wherein a time for setting of said
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