Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1974-02-06
1978-12-12
Lanham, C.W.
Stock material or miscellaneous articles
Composite
Of quartz or glass
32 63, 291606, 295276, 295273, 295274, 295277, B32B 706, E05D 1500, E05D 1526, A61C 512
Patent
active
041296800
ABSTRACT:
A process is disclosed for producing chrome alloys in a form suitable for casting dental appliances. A chrome dental alloy which is inherently capable of being processed, prior to casting the appliance, to wrought form by hot working is first fused to form a melt in a heating means (e.g., an electron beam hearth) which substantially excludes the presence of or substantially removes tramp elements (e.g., carbon, oxygen and nitrogen). The melt is then cast into an ingot which is subsequently hot-worked to form a shaped piece (e.g. bar, strip, rod or wire). The shaped piece is next cut into small weight pieces of predetermined size convenient for handling by dental laboratories and the pieces are coated with water glass (e.g., sodium silicate) so as to protect the pieces from contamination with tramp elements during the heating period preparatory to melting and casting into dental appliances.
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ASM Metals Handbook, 8th Ed., vol. 4, pp. 432-437, "The Forming of Nickel Alloys".
ASM Metals Handbook, 8th Ed., vol. 5, pp. 101, 106, 119-121, 140-142, Published by ASM, Metals Park, Ohio.
Unitek Corp. Catalog No. 113, Cr 1964, pp. 10, 18, 31, 42, 43, Published by Unitek Corp., Monrovia, Calif.
Lanham C.W.
Rising V. K.
Sterndent Corporation
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