Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1987-04-06
1989-11-21
Swisher, Nancy A. B.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428426, 428703, C03C 1502, H01J 2924
Patent
active
048822140
ABSTRACT:
Light transmitting glass has at least one surface area which is matted by surface pits. That surface area has a population of merging or contiguous surface pits, the pits being of such small area and profile that clearly legible typed characters of 10-pitch size are still clearly legible when viewed through such matted surface area when that surface is held at a distance of 10 cm from the said characters. At least one matted surface area may be occupied by a population of surface pits which are of such small size that a disk having a diameter of 10 micrometer cannot be placed thereon without overlapping at least two pits. In order to produce such glass, the surface area is etched with a solution of a salt of hydrofluoric acid to leave a substantially contiguous population of fluorine-containing crystals, those crystals are removed to leave the surface area with a population of merging or contiguous surface pits, and the resulting pitted surface area is treated to remove a superficial stratum therefrom in order to leave the surface area occupied by a population of merging or continguous surface pits which are of such small size that a disk having a diameter of 10 micrometer cannot be placed thereon without overlapping at least two pits. The preferred etching medium is aqueous potassium bifluoride, and the superficial stratum removal is preferably effected by chemical polishing, e.g., using a solution containing hydrofluoric acid.
REFERENCES:
patent: 937550 (1909-10-01), Rembusch
patent: 1694706 (1928-12-01), Herz
patent: 2401537 (1946-06-01), Adams
patent: 2697893 (1954-12-01), Schaum
Glaverbel
Swisher Nancy A. B.
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