Patent US4313555A successfully refreshed from Google Patents.
US4313555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corner lock carton
Assignee: Stone Container Corp
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Filing: 1980-06-16
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Granted: 1982-02-02
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Expires: 2000-06-16
Abstract
Abstract A carton having a bottom tray and cover element. Opposite corners of both the tray and cover element include a locking flap assembly which is part of the adjacent sidewalls of each element, and is used to assemble the tray and cover. The locking flap assemblies include a hook cut in a sidewall flap extension received within a slot cut in an adjacent sidewall.
Inventors
- 👤 William G. Sieffert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:27
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/20; B65D5/30; B65D5/301; B65D5/302
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A carton construction comprising: a tray having a plurality of upright tray sidewalls; at least a first of said tray sidewalls having a laterally extending flap provided with a first hook-like member projecting therefrom; a second of said tray sidewalls, adjacent to said first tray sidewall, having a slot for interleaving engagement with said first hook-like member to lock said first and second tray sidewalls together in an erected state; and a cover having a plurality of upright cover sidewalls; at least a first of said cover sidewalls having a laterally extending flap provided with a second hook-like member projecting therefrom; a second of said cover sidewalls, adjacent to said first cover sidewall, having a slot for interleaving engagement with said second hook-like member to lock said first and second cover sidewalls together in an erected state; said cover being adapted to be received on said tray so that the interlocked corner of said tray is adjacent an unconnected corner of said cover and the interlocked corner of said cover is adjacent an unconnected corner of said tray.
Claim 2
Dependent Claim
178 words
A carton construction comprising: a tray having a plurality of upright tray sidewalls; at least a first of said tray sidewalls having a laterally extending flap provided with a first hook-like member projecting therefrom; a second of said tray sidewalls, adjacent to said first tray sidewall, having a slot for interleaving engagement with said first hook-like member to lock said first and second tray sidewalls together in an erected state; and a cover having a plurality of upright cover sidewalls; at least a first of said cover sidewalls having a laterally extending flap provided with a second hook-like member projecting therefrom; a second of said cover sidewalls, adjacent to said first cover sidewall, having a slot for interleaving engagement with said second hook-like member to lock said first and second cover sidewalls together in an erected state; said cover being adapted to be received on said tray so that the interlocked corner of said tray is adjacent an unconnected corner of said cover and the interlocked corner of said cover is adjacent an unconnected corner of said tray.
Claim 3
Dependent Claim
20 words
The carton of claim 1 wherein said tray and said cover each include a pair of diagonally opposed interlocked corners.
Claim 4
Dependent Claim
44 words
The carton construction of claim 1 wherein said laterally extending flaps of said tray and cover sidewalls are joined to their respective sidewalls by a fold line, and said hook-like members are disposed at an acute angle with respect to their respective fold lines.
Claim 5
Dependent Claim
32 words
The carton construction of claim 3 wherein said slots on said second tray and cover sidewalls are disposed at an acute angle with respect to the top edge of their respective sidewalls.
Claim 6
Dependent Claim
17 words
The carton construction of claim 4 wherein the acute angle of said hook-like members is approximately 30°.
Claim 7
Dependent Claim
16 words
The carton construction of claim 5 wherein the acute angle of said slots is approximately 60°.
References Cited (Backward Citations)
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US186459A
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US242365A
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US1955663A
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US2304362A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |