Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block – Surface modified glass
Reexamination Certificate
2005-06-28
2005-06-28
Hassanzadeh, Parviz (Department: 1763)
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
Surface modified glass
C428S426000, C216S097000, C216S031000
Reexamination Certificate
active
06911261
ABSTRACT:
A method of adjusting the pH of a strengthening melt to provide an adjusted melt for use in microetching glass substrates, such as glass disk substrates for use in data storage devices. A base is added to the strengthening melt to raise its pH. A desired degree of microetch is provided on an aluminosilicate glass disk substrate, for example, by immersion for 2-4 hours at 360° C. in a melt adjusted to have a pH of 10. This single operation both strengthens and microetches the glass substrate. A slight etching of the surface of a glass substrate, i.e., microetching, improves the performance and durability of a data storage disk made from the substrate. To avoid an overly aggressive etch that can create undesirable damage to the substrate surface, an acid may be added to the melt if the pH is subsequently determined to have shifted to above an upper limit.
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U.S. Appl. No. 10/024,693, “PH Adjustment of a Strengthening Melt for use in Strengthering Glass Substrates”, Terry L. Jensen et al., filed Dec. 18, 2001.
U.S. Appl. No. 09/976,167, “Self-Cleaning Colloidal Slurry Composition and Process for Finishing a Surface of a Substrate”, James A. Hagan et al., filed Oct. 12, 2001.
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Jensen Terry Lee
Marier John William
Piltingsrud Douglas Howard
Sprague Rick Allan
Bussan Matthew J.
Hassanzadeh Parviz
International Business Machines - Corporation
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