Cushman, Darby & Cushman
Method of flame abrasion of glass preform
 A glass preform for an optical fiber is flame abrased with an oxyhydrogen flame while vertically suspending and rotating the glass preform and relatively moving one or both of the glass preform and the oxyhydrogen flame, whereby a surface of the glass preform is smoothened. 
Sumitomo Electric Industries, Ltd.
C
C03B
inventional
Masahide Toshio Yuichi Kouji Hiroshi
Saito Danzuka Ohga Amemiya Yokota