US3567111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiply paper bag
Assignee: International Paper Co
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Filing: 1969-04-24
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Granted: 1971-03-02
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Expires: 1989-04-24
Abstract
Abstract A multiply paper bag in which the inner wall of the inner ply is coated with a heat sealable moistureproof material and the end of the bag is folded, sealed and taped to form a leakproof closure. Apparatus for the manufacture of such bags having means for advancing bag blanks one after the other along a path, means along the path for heating the bottom end of the blank to soften the thermoplastic coating, means for applying a sealing force to the softened thermoplastic coating, means for holding the seal while the thermoplastic coating cools and hardens, means for embossing the bag blank along a fold line for folding the bag blank end along the fold line and for folding the folded portion into the sidewall of the blank and means for applying, coating and adhesively securing a tape to the folded portion and the sidewall of the blank.
Inventors
- 👤 Robert O Baxter
- 👤 Clint R Hollis
- 👤 Carlton F Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:15
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
145 words
A multi-ply paper bag having a thermoplastic coating on the inner surface of the innermost ply, a flap at the bottom of said bag extending across the bottom thereof and forming a closure therefor, said flap extending from one side edge of said bag to the other side edge and from the bottom of said bag, when said bag is laid flat, up one sidewall of said bag and a tape across said flap adhesively secured to said flap and to said one sidewall of said bag, said tape covering the ply ends in said flap, said thermoplastic coating on the inner surface of the innermost ply on the opposite sidewalls of said bag in said flap being joined to form a seal along a line extending across said bag in said flap from one side edge of said bag to the other side edge.
Claim 2
Dependent Claim
145 words
A multi-ply paper bag having a thermoplastic coating on the inner surface of the innermost ply, a flap at the bottom of said bag extending across the bottom thereof and forming a closure therefor, said flap extending from one side edge of said bag to the other side edge and from the bottom of said bag, when said bag is laid flat, up one sidewall of said bag and a tape across said flap adhesively secured to said flap and to said one sidewall of said bag, said tape covering the ply ends in said flap, said thermoplastic coating on the inner surface of the innermost ply on the opposite sidewalls of said bag in said flap being joined to form a seal along a line extending across said bag in said flap from one side edge of said bag to the other side edge.
Claim 3
Dependent Claim
30 words
A multi-ply paper bag, as recited in claim 1, in which said inner ply is joined to an outer ply by a water-resistant adhesive along a line in said flap.
Claim 4
Dependent Claim
18 words
A multi-ply paper bag, as recited in claim 2, in which said line of water-resistant adhesive is discontinuous.
Claim 5
Dependent Claim
21 words
A multi-ply paper bag, as recited in claim 3, in which the outer surface of the outer ply is water repellent.
Claim 6
Dependent Claim
24 words
A multi-ply paper bag, as recited in claim 4, in which said thermoplastic coating of the inner surface of the innermost ply is polyethylene.
Claim 7
Dependent Claim
153 words
A two-ply gusseted paper bag having an outer ply and an inner ply, a thermoplastic coating on the inner surface of the inner ply, a flap at the bottom of said bag extending across the bottom thereof and forming a closure therefor, said flap extending from one side edge of said bag to the other side edge and from the bottom of said bag, when said bag is laid flat, up one sidewall of said bag and a tape across said flap adhesively secured to said flap and to said one sidewall of said bag, said tape covering the ply ends in said flap, said thermoplastic coating on the inner surface of the inner ply on the opposite sidewalls of said bag in said flap being joined to form a seal along a line extending across said bag in said flap from one side edge of said bag to the other side edge.
Claim 8
Dependent Claim
153 words
A two-ply gusseted paper bag having an outer ply and an inner ply, a thermoplastic coating on the inner surface of the inner ply, a flap at the bottom of said bag extending across the bottom thereof and forming a closure therefor, said flap extending from one side edge of said bag to the other side edge and from the bottom of said bag, when said bag is laid flat, up one sidewall of said bag and a tape across said flap adhesively secured to said flap and to said one sidewall of said bag, said tape covering the ply ends in said flap, said thermoplastic coating on the inner surface of the inner ply on the opposite sidewalls of said bag in said flap being joined to form a seal along a line extending across said bag in said flap from one side edge of said bag to the other side edge.
Claim 9
Dependent Claim
30 words
A multi-ply paper bag, as recited in claim 6, in which said inner ply is joined to an outer ply by a water-resistant adhesive along a line in said flap.
Claim 10
Dependent Claim
18 words
A multiply paper bag, as recited in claim 7, in which said line of water-resistant adhesive is discontinuous.
Claim 11
Dependent Claim
21 words
A multi-ply paper bag, as recited in claim 8, in which the outer surface of the outer ply is water repellent.
Claim 12
Dependent Claim
24 words
A multi-ply paper bag, as recited in claim 9, in which said thermoplastic coating of the inner surface of the inner ply is polyethylene.
References Cited (Backward Citations)
US1916854A
Cited
US2169936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |