US PATENT SUBCLASS 53 / 569
.~.~ Letter-type envelope


Current as of: June, 1999
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53 /   HD   PACKAGE MAKING

558  DF  APPARATUS FOR FORMING OR PARTIALLY FORMING RECEPTACLE AND SUBSEQUENTLY FILLING {5}
564  DF  .~ Forming by opening or setting up collapsed receptacle {6}
569.~.~ Letter-type envelope


DEFINITION

Classification: 53/569

Letter-type envelope:

(under subclass 564) Apparatus in which the receptacle (a) has sides contacting opposite portions of the contents which sides are connected by a single fold or crease and (b) is closed by a single triangular flap.

(1) Note. The receptacle may be used to enclose postal matter for mailing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

266.1, for apparatus for filling and closing envelopes.

376.3+, for devices for closing envelopes.

SEE OR SEARCH CLASS

156, Adhesive Bonding and Miscellaneous Chemical Manufacture, 441.5, for devices for sealing envelopes.