US PATENT SUBCLASS 400 / 659
.~ Cylindrical platen

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

648  DF  PLATEN OR PLATEN-MOVING MECHANISM {5}
659.~ Cylindrical platen {3}
660  DF  .~.~> Detachably secured to platen carriage {3}
661  DF  .~.~> With sound-muffling means {4}
662  DF  .~.~> Including particular surface characteristic (e.g., translucent, pigment yielding, corrugated, of varying hardness, etc.)

DEFINITION

Classification: 400/659

Cylindrical platen:

(under subclass 648) Subject matter wherein a platen* has a surface that is generated by a line revolving about an axis parallel to the line.

(1) Note. Although the definition of "cylinder" stated above would produce only a smooth-surfaced "right cylinder", it is not intended that a cylindroidal member having minor surface roughness be barred from any of the subclasses indented hereunder. Such minor surface variations are in fact found in the platen members found in subclasses 661.3+, 661.4, or 662 below.