Patent US3785908A successfully refreshed from Google Patents.
US3785908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flute sealing method and apparatus
Assignee: International Paper Co
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Filing: 1972-07-13
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Granted: 1974-01-15
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Expires: 1992-07-13
Abstract
Abstract An apparatus for slitting, compressing, and folding a corrugated core paperboard, comprising means for slitting the end of the corrugated core, means for compressing the slit end inwardly to form extending facing sheet edges and means for folding the extending facing sheet edges, one over the other, to seal the flutes of the paperboard.
Inventors
- 👤 W Wagers
- 👤 R Frappier
- 👤 W Mcdonald
- 👤 C Boggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:02
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2822; B31F1/2827; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/1011; Y10T156/1026; Y10T156/1034; Y10T156/1052; Y10T156/1062; Y10T156/1064; Y10T156/1082; Y10T156/1084; Y10T156/1087
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
An apparatus for forming an end closure on a paperboard having a corrugated core and facing sheets secured to the opposite sides of said corrugated core, said apparatus comprising, means for slitting the end of said corrugated core inwardly and substantially parallel to said facing sheets, means for compressing said slit end of said core inwardly between said facing sheets leaving the edges of said facing sheet extending beyond said compressed end of said core, means for folding first one, and then the other, of said extending edges of said facing sheets over said compressed end of said core so that the extension of one of said facing sheets is in contact with the compressed end of said core and the extension of the other of said facing sheets is in contact with and overlapping said folded extension of said one of said facing sheets, said folded extensions of said facing sheets being in a plane substantially normal to the planes of said facing sheets.
Claim 2
Independent Claim
165 words
An apparatus for forming an end closure on a paperboard having a corrugated core and facing sheets secured to the opposite sides of said corrugated core, said apparatus comprising, means for slitting the end of said corrugated core inwardly and substantially parallel to said facing sheets, means for compressing said slit end of said core inwardly between said facing sheets leaving the edges of said facing sheet extending beyond said compressed end of said core, means for folding first one, and then the other, of said extending edges of said facing sheets over said compressed end of said core so that the extension of one of said facing sheets is in contact with the compressed end of said core and the extension of the other of said facing sheets is in contact with and overlapping said folded extension of said one of said facing sheets, said folded extensions of said facing sheets being in a plane substantially normal to the planes of said facing sheets.
Claim 3
Dependent Claim
34 words
An apparatus as recited in claim 1 in which said means for slitting the end of said corrugated core, includes a knife mounted for rotation about an axis substantially perpendicular to said facing sheets.
Claim 4
Dependent Claim
25 words
An apparatus as recited in claim 2 in which said means for folding said extending edges includes guides mounted axially in alignment with said knife.
Claim 5
Dependent Claim
36 words
An apparatus as recited in claim 3 in which said apparatus includes means for adhesively securing the folded edge of one of said facing sheets to the folded edge of the other of said facing sheets.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |