US PATENT SUBCLASS 229 / 92.1
.~ Letter sheets


Current as of: June, 1999
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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

87.01  DF  WRAPPER {17}
92.1.~ Letter sheets {4}
92.3  DF  .~.~> Window
*  DD  .~.~> Closures
92.5  DF  .~.~> Fastener
92.7  DF  .~.~> Closure flap


DEFINITION

Classification: 229/92.1

(under subclass 87) Subject matter comprising sheets designed to receive a written or printed communication and then to be folded into a form generally resembling the conventional envelope. Devices which when folded form flat open-ended tubes are included, but not mere single-folded cards, unless some special fastening means is formed in the blank.