US PATENT SUBCLASS 65 / 428
.~.~.~ Collapsing tube

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

376  DF  PROCESSES OF MANUFACTURING FIBERS, FILAMENTS, OR PREFORMS {18}
385  DF  .~ Process of manufacturing optical fibers, waveguides, or preforms thereof {29}
427  DF  .~.~ Consolidating preform (e.g., sintering, etc.) {1}
428.~.~.~ Collapsing tube

DEFINITION

Classification: 65/428

Collapsing tube:

(under subclass 427) Processes including a step causing an innermost surface of a tube to cave in upon itself.