Patent US3908890A successfully refreshed from Google Patents.
US3908890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealable carton and method of forming same
Assignee: Kliklok LLC
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Filing: 1972-04-14
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Granted: 1975-09-30
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Expires: 1992-04-14
Abstract
Abstract A carton of paperboard or the like has thermoplastic adhesive applied to the surfaces to be bonded and employs major end panels, end flaps and minor end panel strips to form a leakproof carton with a minimum size flat stock blank. In the blank, the end flaps are articulated to the opposite sides of the bottom panel for bonding to the major end panel and with a guide tab to guide said flaps during folding. A minor end panel strip overlies the free edge of the major end panel to complete the sealed carton. Embossed fold beads cooperate with free edges to enhance sealing efficiency and the panel forming slits are spaced from the center line of the beads to provide further caulking of the joints. Blanks are oppositely directed on the flat stock with the major and minor panels, and the guide tabs being contiguous to each other for conservation of material. Hot air nozzles are provided at a process station to activate preapplied thermoplastic material on not only the panels, but also on the fold beads.
Inventors
- 👤 Thomas R Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:33
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/18; Y; Y10; Y10S; Y10S229/00; Y10S229/93; Y10S229/941
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
292 words
A foldable carton of paperboard or the like having overlying panels to be bonded to each other by thermoplastic adhesive material on at least one of each pair of the surfaces to be bonded comprising a bottom panel, a pair of major side panels articulated to opposite sides of said bottom panel, major end flaps articulated to the other two sides of said bottom panel, major end panels articulated to two upstanding edges of one of said side panels, the width of said end panels and said end flaps being substantially the same as said bottom panel for full overlap, minor end panel strips articulated to the upstanding edges of the other side panel to overlie the free edge of said major end panels, said end flaps having a thermoplastic adhesive material strip across the full width thereof adjacent said bottom panel for bonding to said major end panel, and said end flaps each including a guide tab above said strip only on the side adjacent said major end panel for extended engagement with said end panel for guiding the same during folding, said carton being formed of blanks cut from flat stock, adjacent blanks being oppositely directed with the major end panel of one beiing contiguous with the minor end panel strip of the other, said end flap including said guide tab of one blank being formed in the stock contiguous to said end flap including said guide tab of the of the other blank, and the adjacent guide tabs on the flat stock being defined by a diagonal bisecting line, whereby said tabs are triangular to give maximum resistance to bending during folding and simplicity of blank cutting and whereby a full sealed bottom is assured while paperboard is conserved.
Claim 2
Dependent Claim
292 words
A foldable carton of paperboard or the like having overlying panels to be bonded to each other by thermoplastic adhesive material on at least one of each pair of the surfaces to be bonded comprising a bottom panel, a pair of major side panels articulated to opposite sides of said bottom panel, major end flaps articulated to the other two sides of said bottom panel, major end panels articulated to two upstanding edges of one of said side panels, the width of said end panels and said end flaps being substantially the same as said bottom panel for full overlap, minor end panel strips articulated to the upstanding edges of the other side panel to overlie the free edge of said major end panels, said end flaps having a thermoplastic adhesive material strip across the full width thereof adjacent said bottom panel for bonding to said major end panel, and said end flaps each including a guide tab above said strip only on the side adjacent said major end panel for extended engagement with said end panel for guiding the same during folding, said carton being formed of blanks cut from flat stock, adjacent blanks being oppositely directed with the major end panel of one beiing contiguous with the minor end panel strip of the other, said end flap including said guide tab of one blank being formed in the stock contiguous to said end flap including said guide tab of the of the other blank, and the adjacent guide tabs on the flat stock being defined by a diagonal bisecting line, whereby said tabs are triangular to give maximum resistance to bending during folding and simplicity of blank cutting and whereby a full sealed bottom is assured while paperboard is conserved.
Claim 3
Dependent Claim
63 words
The carton of claim 1 wherein said carton has said panels and end flaps delineated by embossed lines, the convex side of said lines being on the inside of said carton to form fold beads, the free edge of said major end panel abutting the fold bead for said minor end panel strip to assist in forming the side seal of said carton.
Claim 4
Dependent Claim
30 words
The carton of claim 2 wherein the fold bead for said panel strip has sufficient adhesive applied to form a caulking line for enhanced sealing with the mating free edge.
Claim 5
Dependent Claim
35 words
The carton of claim 3 wherein the fold bead for said major end panel ahs sufficient adhesive applied to form a caulking line with the lower portion of abutting free edge of said end flap.
Claim 6
Dependent Claim
32 words
The carton of claim 3 wherein said panel strip and its fold bead have adhesive material substantially over the full expanse thereof to further enhance the sealing efficiency of the side seal.
Claim 7
Dependent Claim
57 words
The carton of claim 2 wherein are provided slits forming said panels and end flaps, said slits only extending substantially up to the outer limit of the convex surface of said embossed lines to cause full compression of said convex surface and whereby puckering of excess paperboard and adhesive caulks the corner formed to obviate pinhole leakage.
Claim 8
Dependent Claim
34 words
The carton of claim 2 wherein said end flap in the region of said adhesive material strip abuts the inside fold bead of the major end panel to further provide an efficient sealing relationship.
Claim 9
Dependent Claim
20 words
The carton of claim 2 wherein said fold beads are provided with adhesive material for positive sealing and caulking action.
Claim 10
Dependent Claim
209 words
A foldable carton of paperboard or the like having overlying panels to be bonded to each other by thermoplastic adhesive material on at least one of each pair of the surfaces to be bonded comprising a bottom panel, a pair of major side panels articulated to opposite sides of said bottom panel, major end flaps articulated to the other two sides of said bottom panel, major end panels articulated to two upstanding edges of one of said side panels, the width of said end panels and said end flaps being substantially the same as said bottom panel for full overlap, minor end panel strips articulated to the upstanding edges of the other side panel to overlie the free edge of said major end panels, said end flaps having a thermoplastic adhesive material strip across the full width thereof adjacent said bottom panel for bonding to said major end panel, and said end flaps each incuding a guide tab above said strip only on the side adjacent said major end panel for extended engagement with said end panel for guiding the same during folding, said guide tab of said end flap being substantially free of adhesive material to allow relatively resistance-free guiding movement against said major end flap during folding.
Claim 11
Dependent Claim
209 words
A foldable carton of paperboard or the like having overlying panels to be bonded to each other by thermoplastic adhesive material on at least one of each pair of the surfaces to be bonded comprising a bottom panel, a pair of major side panels articulated to opposite sides of said bottom panel, major end flaps articulated to the other two sides of said bottom panel, major end panels articulated to two upstanding edges of one of said side panels, the width of said end panels and said end flaps being substantially the same as said bottom panel for full overlap, minor end panel strips articulated to the upstanding edges of the other side panel to overlie the free edge of said major end panels, said end flaps having a thermoplastic adhesive material strip across the full width thereof adjacent said bottom panel for bonding to said major end panel, and said end flaps each incuding a guide tab above said strip only on the side adjacent said major end panel for extended engagement with said end panel for guiding the same during folding, said guide tab of said end flap being substantially free of adhesive material to allow relatively resistance-free guiding movement against said major end flap during folding.
Claim 12
Dependent Claim
226 words
A foldable carton of paperboard or the like having overlying panels to be bonded to each other by thermoplastic adhesive material on at least one of each pair of the surfaces to be bonded comprising a bottom panel, a pair of major side panels articulated to opposite sides of said bottom panel, major end flaps articulated to the other two sides of said bottom panel, major end panels articulated to two upstanding edges of one of said side panels, the width of said end panels and said end flaps being substantially the same as said bottom panel for full overlap, minor end panel strips articulated to the upstanding edges of the other side panel, the free edge of said major end panel abutting the inside of the fold forming the panel strip and forming a seal therewith, the free edge of said end flap abutting the fold forming the major end panel and forming a seal therewith, said folds being created along embossed lines, the convex side of said lines being on the inside of said carton to form raised fold beads, said fold beads having sufficient adhesive material applied to form a caulking line, whereby efficient sealing without leakage channels or corner pinholes, enhanced sealing along the free edge and the fold of the major end panel, and a simplified carton blank structure are realized.
Claim 13
Dependent Claim
226 words
A foldable carton of paperboard or the like having overlying panels to be bonded to each other by thermoplastic adhesive material on at least one of each pair of the surfaces to be bonded comprising a bottom panel, a pair of major side panels articulated to opposite sides of said bottom panel, major end flaps articulated to the other two sides of said bottom panel, major end panels articulated to two upstanding edges of one of said side panels, the width of said end panels and said end flaps being substantially the same as said bottom panel for full overlap, minor end panel strips articulated to the upstanding edges of the other side panel, the free edge of said major end panel abutting the inside of the fold forming the panel strip and forming a seal therewith, the free edge of said end flap abutting the fold forming the major end panel and forming a seal therewith, said folds being created along embossed lines, the convex side of said lines being on the inside of said carton to form raised fold beads, said fold beads having sufficient adhesive material applied to form a caulking line, whereby efficient sealing without leakage channels or corner pinholes, enhanced sealing along the free edge and the fold of the major end panel, and a simplified carton blank structure are realized.
Claim 14
Dependent Claim
69 words
The carton of claim 10 wherein is further provided slits forming the panels and end flaps, said slits extending only substantially up to the outer limit of the convex surface of said embossed lines, whereby to cause full compression of said convex surface upon folding of the carton, puckering of excess paperboard and concentration of adhesive to caulk the corner of the carton so as to obviate pinhole leakage.
Claim 15
Dependent Claim
28 words
The carton of claim 10 wherein said panel strip and its fold bead have adhesive applied substantially over the full expanse thereof to further enhance the sealing efficiency.
Claim 16
Dependent Claim
40 words
The carton of claim 10 wherein is formed a portion of the fold bead of said major end panel abutting the free edge of said end flap, said portion only having adhesive applied thereto to further enhance the sealing efficiency.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |