US PATENT SUBCLASS 65 / 439
.~ Producing hollow fibers or tubular preforms

Current as of: June, 1999
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65 /   HD   GLASS MANUFACTURING

376  DF  PROCESSES OF MANUFACTURING FIBERS, FILAMENTS, OR PREFORMS {18}
439.~ Producing hollow fibers or tubular preforms

DEFINITION

Classification: 65/439

Producing hollow fibers or tubular preforms:

(under subclass 376) Processes wherein the glass fiber or tubular preform produced has a hollow core or an empty cavity.