US5388758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antibuckling clamshell package
Assignee: International Paper Co
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Filing: 1993-12-21
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Granted: 1995-02-14
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Expires: 2013-12-21
Abstract
Abstract A clamshell type container formed of a unitary blank of paperboard. The rear wall of the container includes a hinge line to permit opening and closing of the top cover. Buckling sometimes occurs at this hinge line upon cover opening. According to this invention four curved cut lines are provided in the common rear wall having the hinge line. The ends of these cut lines are pairwise contiguous and are spaced only slightly apart. The four pairs of contiguous cut line ends form the corners of an imaginary rectangle. Two opposite corners of the rectangle lie on the hinge line, while the remaining two opposite corners lie laterally of the hinge line on respective opposite sides thereof.
Inventors
- 👤 Daniel B. Scovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:13
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/42; B65D5/4266; B65D5/64; B65D5/66; B65D5/6626; B65D5/665; B65D5/667; Y; Y10; Y10S; Y10S229/00; Y10S229/92; Y10S229/93
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
195 words
A clamshell container formed from a unitary paperboard blank, the container having a cover and a lower tray, said cover and said tray each having a top wall and three or more sidewalls, a first of said sidewalls of said cover and said tray each forming a rear wall, said cover rear wall and said tray rear wall being integral with each other to define a common rear panel and being hingedly connected to each other by a hinge line, said hinge line extending across the container, four arcuate cut lines each extending through said rear panel, said four arcuate cut lines forming a generally star shaped area, each cut line having a terminal at each end of said cut line, the termini of said four cut lines generally defining four corners of an imaginary parallelogram, two opposite of said four corners of said imaginary parallelogram lying on said hinge line and two other opposite of said four corners of said imaginary parallelogram lying, respectively, on opposite sides of said hinge line, respective said termini spaced from each other to thereby form necks at tips of said star shaped area of said common rear panel.
Claim 2
Dependent Claim
195 words
A clamshell container formed from a unitary paperboard blank, the container having a cover and a lower tray, said cover and said tray each having a top wall and three or more sidewalls, a first of said sidewalls of said cover and said tray each forming a rear wall, said cover rear wall and said tray rear wall being integral with each other to define a common rear panel and being hingedly connected to each other by a hinge line, said hinge line extending across the container, four arcuate cut lines each extending through said rear panel, said four arcuate cut lines forming a generally star shaped area, each cut line having a terminal at each end of said cut line, the termini of said four cut lines generally defining four corners of an imaginary parallelogram, two opposite of said four corners of said imaginary parallelogram lying on said hinge line and two other opposite of said four corners of said imaginary parallelogram lying, respectively, on opposite sides of said hinge line, respective said termini spaced from each other to thereby form necks at tips of said star shaped area of said common rear panel.
Claim 3
Dependent Claim
18 words
The clamshell container of claim 1 wherein each of said four cut lines is of the same shape.
Claim 4
Dependent Claim
23 words
The container of claim 1 wherein said cover and said tray are each in the general form of a truncated, four sided pyramid.
Claim 5
Dependent Claim
13 words
The container of claim 1 wherein said imaginary parallelogram is an imaginary rectangle.
Claim 6
Dependent Claim
17 words
The blank of claim 1 wherein each of said four necks is of substantially the same width.
Claim 7
Dependent Claim
161 words
A unitary paperboard blank for forming a clamshell type container, the blank including a rear wall panel for the clamshell cover and a rear wall panel for the clamshell tray, said two rear wall panels coupled by a hinge line and forming a common rear wall panel, the improvement comprising, four arcuate cut lines in said common rear wall panel with each extending therethrough, each cut line having two ends, corresponding pairs of said cut line ends being contiguous to each other, said corresponding pairs of said cut line ends located at four corners of an imaginary parallelogram, two opposite of said four parallelogram corners lying on said hinge line and the remaining two opposite of said four parallelogram corners each located, respectively, laterally of said hinge line, said four arcuate cut lines forming a generally star shaped area having four narrow necks which join said generally star shaped area within said four arcuate cut lines to said common rear panel.
Claim 8
Dependent Claim
161 words
A unitary paperboard blank for forming a clamshell type container, the blank including a rear wall panel for the clamshell cover and a rear wall panel for the clamshell tray, said two rear wall panels coupled by a hinge line and forming a common rear wall panel, the improvement comprising, four arcuate cut lines in said common rear wall panel with each extending therethrough, each cut line having two ends, corresponding pairs of said cut line ends being contiguous to each other, said corresponding pairs of said cut line ends located at four corners of an imaginary parallelogram, two opposite of said four parallelogram corners lying on said hinge line and the remaining two opposite of said four parallelogram corners each located, respectively, laterally of said hinge line, said four arcuate cut lines forming a generally star shaped area having four narrow necks which join said generally star shaped area within said four arcuate cut lines to said common rear panel.
Claim 9
Dependent Claim
13 words
The blank of claim 6 wherein said imaginary parallelogram is an imaginary rectangle.
Claim 10
Dependent Claim
17 words
The blank of claim 6 wherein each of said four necks is of substantially the same width.
Claim 11
Dependent Claim
206 words
A clamshell container formed from a unitary paperboard blank, the container having a cover and a lower tray, said cover and said tray each having a top wall and three or more sidewalls, a first of said sidewalls of said cover and said tray each forming a rear wall, said cover rear wall and said tray rear wall being integral with each other to define a common rear panel and being hingedly connected to each other by a hinge line, said hinge line extending across the container, four separate cut lines each extending through said rear panel, each cut line having a terminal at each end of said cut line, the termini of said four cut lines generally defining corners of an imaginary parallelogram, two opposite of said corners of said imaginary parallelogram lying on said hinge line and two other opposite of said corners of said imaginary parallelogram lying, respectively, on opposite sides of said hinge line, said cut lines defining an area within said common rear panel, respective said termini at each of said corners of said imaginary parallelogram spaced from each other to thereby form four necks at tips at the area of said common rear panel enclosed by said four cut lines.
Claim 12
Dependent Claim
206 words
A clamshell container formed from a unitary paperboard blank, the container having a cover and a lower tray, said cover and said tray each having a top wall and three or more sidewalls, a first of said sidewalls of said cover and said tray each forming a rear wall, said cover rear wall and said tray rear wall being integral with each other to define a common rear panel and being hingedly connected to each other by a hinge line, said hinge line extending across the container, four separate cut lines each extending through said rear panel, each cut line having a terminal at each end of said cut line, the termini of said four cut lines generally defining corners of an imaginary parallelogram, two opposite of said corners of said imaginary parallelogram lying on said hinge line and two other opposite of said corners of said imaginary parallelogram lying, respectively, on opposite sides of said hinge line, said cut lines defining an area within said common rear panel, respective said termini at each of said corners of said imaginary parallelogram spaced from each other to thereby form four necks at tips at the area of said common rear panel enclosed by said four cut lines.
Claim 13
Dependent Claim
15 words
The clamshell container of claim 9 wherein each of said cut lines is concavely curved.
References Cited (Backward Citations)
US1839752A
Cited
US2247870A
Cited
US2934252A
Cited
US4232816A
Cited
US4266713A
Cited
US4301960A
Cited
US4431128A
Cited
US5039003A
Cited
US4792085A
Cited
US4955527A
Cited
US4877178A
Cited
US5090571A
Cited
US5205476A
Cited
US5221040A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |