US5553772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paperboard clamshell carton
Assignee: International Paper Co
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Filing: 1995-10-31
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Granted: 1996-09-10
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Expires: 2015-10-31
Abstract
Abstract A clamshell type container is formed from a unitary blank of paperboard. The central portion of the crown of the carton is convex upwardly and the crown carries inwardly concave opposite side walls. The four corners of the crown are each provided with triangular gussets to permit slight deformation of the crown both upon stacking of the open cartons and upon closing the crown down onto the lower tray part of the carton. The tray side walls are curved or recessed downwardly so as to form line contact with a respective crown side wall, such contact defining a seal and inhibiting warm air loss when a warm foodstuff is placed in the carton.
Inventors
- 👤 Kurt D. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:22
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/42; B65D5/64; B65D5/66; B65D5/6626; B65D5/665; B65D5/667; Y; Y10; Y10S; Y10S229/00; Y10S229/902; Y10S229/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A one piece clamshell carton having a bottom tray including a bottom panel, two upstanding side panels, a rear panel and a front panel, said carton also having a crown including a top panel, two side panels, a rear panel and a front panel, said tray and crown rear panels being foldably joined about a common rear horizontal axis, said crown side walls being concave towards each other, said crown being swingable about said rear horizontal axis to close said tray, a portion of respective said side panels of said crown extending downwardly beyond a portion of respective said tray side panels,,said crown side panels located outwardly of said tray side panels, said crown front wall located outwardly of said tray front wall, a lowest portion of said crown front wall extending downwardly relative to a portion of said tray front wall.
Claim 2
Dependent Claim
142 words
A one piece clamshell carton having a bottom tray including a bottom panel, two upstanding side panels, a rear panel and a front panel, said carton also having a crown including a top panel, two side panels, a rear panel and a front panel, said tray and crown rear panels being foldably joined about a common rear horizontal axis, said crown side walls being concave towards each other, said crown being swingable about said rear horizontal axis to close said tray, a portion of respective said side panels of said crown extending downwardly beyond a portion of respective said tray side panels,,said crown side panels located outwardly of said tray side panels, said crown front wall located outwardly of said tray front wall, a lowest portion of said crown front wall extending downwardly relative to a portion of said tray front wall.
Claim 3
Dependent Claim
67 words
The carton of claim 1 wherein said tray side panels each have a free edge, each free edge being concavely curved, whereby said concave side panels of said crown substantially contact respective said tray side panel curved free edges, along respective curved lines, to thereby assist in retaining beat in the carton when a hot food product is placed in the carton and said carton is closed.
Claim 4
Dependent Claim
20 words
The carton of claim 2 including means carried by said carton top to releasably latch said crown to said tray.
Claim 5
Dependent Claim
22 words
The carton of claim 1 wherein said crown top panel is convexly upwardly curved so as to define a part cylindrical surface.
Claim 6
Dependent Claim
29 words
The carton of claim 4 wherein said crown side panels have upper edges which are joined along concave fold lines to respective opposite edges of said crown top panel.
Claim 7
Dependent Claim
31 words
The carton of claim 1 wherein said crown has four corners, each corner having a triangular gusset panel to thereby permit said crown to more readily deform from a normal configuration.
References Cited (Backward Citations)
GB191402410A
Cited
GB773138A
Cited
US3010571A
Cited
US3078989A
Cited
US3343660A
Cited
US3511433A
Cited
USD264687S
Cited
US5039003A
Cited
USD309105S
Cited
US4930681A
Cited
USD321324S
Cited
USD320743S
Cited
US4951865A
Cited
US5188284A
Cited
US5205476A
Cited
US5332147A
Cited
US5388758A
Cited
US5431333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-10 | 2000-03-11 | 2000-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-10 | 2004-03-11 | 2004-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-10 | 2008-03-11 | 2008-09-10 | $7700.00 | Window Closed / Lapsed |