US3568576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing carrier bags
Assignee: Individual
•
Filing: 1968-06-24
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Granted: 1971-03-09
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Expires: 1988-06-24
Abstract
Abstract A method of producing a carrier bag from synthetic thermoplastic foil having a reinforcement at the upper edge of the carrier bag and punched grip apertures passing through both walls of the carrier bag. The foil can either be a flat band or in tubular form which is longitudinally slit. Furthermore, reinforcing inserts may be intermittently spaced along the longitudinal edges of the foil. The edges of the foil may then be longitudinally slit so as to form longitudinal strips, which in turn are bent around the cut edge of the foil and welded to the foil. If the foil has not been doubled onto itself, it is then folded along its longitudinal medium line, and the folded edges are welded and transverse welds and cuts are made along the foil to form the carrier bags.
Inventors
- 👤 Michael Lehmacher
- 👤 Hans Lehmacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:16
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/06; B65D33/08; A; A45; A45C; A45C3/00; A45C3/04; B29; B29C; B29C63/00; B29C63/0026; B29C63/0034; B29C63/0039; B65D33/02; B29C2793/00; B29C2793/0081; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; B31; B31B; B31B70/00; B31B70/74; B31B70/86; B31B70/876
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
In a method of continuously producing carrier bags from synthetic thermoplastic foil with a reinforcement at the upper edges of each carrier bag and with punched out grip apertures passing through both walls of each carrier bag, the improvement comprising the steps of providing two continuous longitudinal strips of synthetic thermoplastic foil; continuously folding each said strip along its longitudinal median axis into a U-shape and continuously inserting a longitudinal edge of a folded synthetic thermoplastic foil band in each said U-shape strip up to the longitudinal median axis; welding the edges of each said U-shape strip to said foil band; punching said grip apertures; and cutting and welding transverse said foil band to form the finished carrier bag.
Claim 2
Dependent Claim
119 words
In a method of continuously producing carrier bags from synthetic thermoplastic foil with a reinforcement at the upper edges of each carrier bag and with punched out grip apertures passing through both walls of each carrier bag, the improvement comprising the steps of providing two continuous longitudinal strips of synthetic thermoplastic foil; continuously folding each said strip along its longitudinal median axis into a U-shape and continuously inserting a longitudinal edge of a folded synthetic thermoplastic foil band in each said U-shape strip up to the longitudinal median axis; welding the edges of each said U-shape strip to said foil band; punching said grip apertures; and cutting and welding transverse said foil band to form the finished carrier bag.
Claim 3
Dependent Claim
105 words
A method according to claim 1, comprising the further steps of cutting said longitudinal strips from the longitudinal edges of said foil band and folding them over the cut edges of said foil band; folding said foil band over onto itself along its longitudinal median line; and applying intermittently spaced reinforcing inserts juxtaposed at least one longitudinal edge of said foil band so that they are continuously covered by said folded longitudinal strip, the edges of which strip are continuously welded to said foil band, and said cutting and welding transverse to said foil band is performed in the gaps between said spaced reinforcing inserts.
Claim 4
Dependent Claim
30 words
A method according to claim 2, wherein said reinforcing inserts are applied to said foil band at a distance from its longitudinal edges of double the width of said insert.
Claim 5
Dependent Claim
41 words
A method according to claim 2, wherein said reinforcing inserts are applied tO both longitudinal edges of said foil band, and the insert applied to one said edge is of double width relative the insert applied to the other said edge.
Claim 6
Dependent Claim
92 words
A method according to claim 1, wherein the initial synthetic thermoplastic foil band is in the form of a hose and including the further step of longitudinally cutting said hose to form the folded foil band; cutting said longitudinal strips from both longitudinal edges of said folded foil band; sliding said longitudinal strips into said folded band by half their width and folding the other half of said strips 180* around the cut edges on said folded foil band; and then continuously longitudinally welding said folded strips to said folded foil band.
Claim 7
Dependent Claim
122 words
A method according to claim 5, comprising the further steps of intermittently inserting spaced reinforcing inserts between said folded foil band and said folded strips before said strips are welded, said inserting occurring in a direction transverse to a direction of movement of said folded foil band, said inserts having been cut off from a web of material the width of which corresponds to desired length of said reinforcing inserts and the length of said reinforcing inserts being so dimensioned that it is shorter than the final width of the carrier bags, so that said intermittently spaced reinforcing inserts have a gap therebetween in which said transverse closure weld with an intermediate separating cut are effected for separating the finished carrier bag.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |