US3645815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of closing bottom flaps of paper bags
Assignee: HG Weber and Co Inc
•
Filing: 1969-12-12
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Granted: 1972-02-29
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Expires: 1989-12-12
Abstract
Abstract A method of securing the trailing bottom flaps of paper bags into place on the bag bottoms after the leading flaps have been secured, the method comprising thrusting the trailing flap flatwise against the body of the bag and then folding the bottom backwardly onto the trailing flap and pressing the same thereagainst until preapplied adhesive has set.
Inventors
- 👤 Clifford J Bedore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:17
CPC Classifications
B; B65; B65D; B65D31/00; B65D31/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A method of closing the bottom of a paper bag, especially suitable for production of bags on high speed forming machines in which paper sheet is tubularly shaped and an open Bottom structure provided including a leading flap and a trailing flap considered from the standpoint of the direction of travel of the bags in the production stream of the machine, comprising: applying adhesive to surface areas of the open bottom which are to be secured together in the closing of the bottom by said flaps; bending over the leading flap and securing it by means of said adhesive to the open bag bottom; and thereafter folding the still partially open bag bottom and the bag body together and clamping said trailing flap therebetween and thereby effecting adhesive bonding of the trailing flap into closing relation to said bottom and in overlapping relation to the folded-over leading flap.
Claim 2
Independent Claim
148 words
A method of closing the bottom of a paper bag, especially suitable for production of bags on high speed forming machines in which paper sheet is tubularly shaped and an open Bottom structure provided including a leading flap and a trailing flap considered from the standpoint of the direction of travel of the bags in the production stream of the machine, comprising: applying adhesive to surface areas of the open bottom which are to be secured together in the closing of the bottom by said flaps; bending over the leading flap and securing it by means of said adhesive to the open bag bottom; and thereafter folding the still partially open bag bottom and the bag body together and clamping said trailing flap therebetween and thereby effecting adhesive bonding of the trailing flap into closing relation to said bottom and in overlapping relation to the folded-over leading flap.
Claim 3
Dependent Claim
37 words
A method according to claim 1, including scoring the body along a transverse line coincident with juncture of the trailing flap with the bag bottom, and effecting folding of the bag bottom along said transverse score line.
Claim 4
Dependent Claim
32 words
A method according to claim 1, wherein said adhesive is applied along an end portion of the trailing flap and the trailing flap is thereby adhesively bonded to the already-attached leading flap.
Claim 5
Dependent Claim
46 words
A method according to claim 1, comprising applying said adhesive only to said trailing flap and to the portions of the open bag bottom against which said leading flap and said trailing flap are to be secured while the leading flap remains free of the adhesive.
Claim 6
Dependent Claim
37 words
A method according to claim 1, wherein said bag bottom is folded over onto the trailing flap lying on top of the bag body, and downward pressure is applied against the folded-over bottom to effect said clamping.
Claim 7
Dependent Claim
34 words
A method according to claim 1, comprising turning out the fully closed bag bottom to reduce the thickness in the collapsed bottom area of the bag to facilitate stacking of one bag upon another.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |