Envelopes – wrappers – and paperboard boxes – Paperboard box – With closure for an access opening
Reexamination Certificate
2000-04-20
2001-09-25
Elkins, Gary E. (Department: 3727)
Envelopes, wrappers, and paperboard boxes
Paperboard box
With closure for an access opening
C229S103200, C229S185000
Reexamination Certificate
active
06293460
ABSTRACT:
SUMMARY OF THE INVENTION
The present invention is directed to a carton formed from a blank having foldable sections in which the top panels of each of the sections cooperate to engage each other through a locking mechanism. Spaced apart top panels are provided with notches at the ends thereof and alternating spaced apart top panels include edge portions such that the edge portions interlock with the notches to secure the foldable sections into place and thereby form a sturdy carton.
SUMMARY OF THE INVENTION
The present invention is generally directed to a carton formed from a blank having sections which are foldable along parallel fold lines. At least one pair of panels include a locking mechanism enabling the sections to be folded into an interlocking relationship through the locking mechanism to provide a sturdy carton. In a particular aspect of the present invention spaced apart panels of one pair of sections are provided with notches at opposed ends thereof which can receive and thereby lock the corresponding spaced apart panels of the other pair of sections through an edge portion. The edge portions of the spaced apart panels which are insertable into the notches are comprised of a slanted portion and a straight portion which come together at a junction defining an obtuse angle. The respective junctions of the pair of spaced apart panels lockingly engage the notches of the other pair of spaced apart panels to thereby secure the carton in place when the sections are folded into the form of a carton without the need for glues, adhesives, staples or other similar securing devices.
In a preferred form of the invention the notches are formed from converging cutlines that meet at a junction which is curvilinear. In another preferred form of the invention, the slanted portion of the edge portion is curvilinear to provide greater resistance to tearing. In a further preferred form of the invention, a gap is provided between the slanted portion and the straight portion to provide enhanced interlocking between the edge portion and the notch.
REFERENCES:
patent: 1546601 (1925-07-01), Morris
patent: 2970741 (1961-02-01), Stone et al.
patent: 2973129 (1961-02-01), Stone et al.
patent: 3374937 (1968-03-01), Wilson
patent: 3455498 (1969-07-01), Gadiel
patent: 3539090 (1970-11-01), Blasdell
patent: 5328088 (1994-07-01), Lonczak
patent: 6076730 (2000-06-01), Boutin et al.
Abshire Tony Joseph
Boutin John Randall
Jambois Brian Keith
Elkins Gary E.
International Paper Company
Watov & Kipnes P.C.
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