US PATENT SUBCLASS 400 / 237
.~ Ribbon, per se

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

191  DF  INCLUDING INTERPOSED INKING DEVICE (E.G., RIBBON) FOR RECORD-MEDIUM {15}
237.~ Ribbon, per se {4}
238  DF  .~.~> Having leader portion (e.g., for threading, etc.)
239  DF  .~.~> With ribbon-reversing indicator or device on ribbon
240  DF  .~.~> Including differently pigmented fields {4}
241  DF  .~.~> Particular ribbon material {3}

DEFINITION

Classification: 400/237

Ribbon, per se:

(under subclass 191) Subject matter wherein the transfer-medium* is a ribbon* and significance is attributed to the structure or characteristics of the ribbon.

SEE OR SEARCH THIS CLASS, SUBCLASS:

194, for an endless ribbon.