US PATENT SUBCLASS 65 / 422
.~.~.~.~ With dehydration (e.g., OH removal, etc.)

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}
413  DF  .~.~ With step of vapor deposition {4}
421  DF  .~.~.~ Outside of tube or rod by soot buildup {1}
422.~.~.~.~ With dehydration (e.g., OH removal, etc.)

DEFINITION

Classification: 65/422

With dehydration (e.g., OH removal, etc.):

(under subclass 421) Processes wherein moisture or hydroxyl radicles are eliminated.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids, for drying processes, per se. Combinations of glassworking and drying operations are proper for Class 65.