Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Reexamination Certificate
2006-01-10
2006-01-10
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
C428S212000, C428S409000, C216S002000, C216S072000, C216S074000, C216S095000
Reexamination Certificate
active
06984436
ABSTRACT:
In homogeneous materials, etching characteristics depend on properties inherent in these materials regardless of whether they are isotropic or anisotropic, and there have been limitations in realizing various desired shapes. A subject for the invention is to provide a gradient material which eliminates these limitations.A gradient material is provided in which the rate of etching with a specific chemical substance changes continuously or by steps from the outermost surface to an inner part thereof. This gradient material is made of a main material which contains an additive capable of changing the etching rate of the main material so that the concentration of the additive changes continuously or by steps. Especially when a glass material containing SiO2as the main component is used as the main material and fluorine is used as the additive, then a gradient material in which the rate of etching with an aqueous solution of hydrofluoric acid changes in the depth direction can be obtained.
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Koyama Tadashi
Nishii Junji
Yamaguchi Jun
Blackwell Gwendolyn
Jones Deborah
National Institute of Advanced Industrial Science and Technology
Nippon Sheet Glass Co. Ltd.
Whitham Curtis & Christofferson, PC
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