US3773591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of carrier bags
Assignee: Coloroll Ltd
•
Filing: 1971-05-03
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Granted: 1973-11-20
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Expires: 1991-05-03
Abstract
Abstract The invention is concerned with the manufacture of a plastics carrier bag including a handle loop having the ends attached to an anchor element which is trapped between two layers of material adjacent the bag mouth. In the invention handle loop assemblies are drawn into a machine which continuously manufactures the bags and traps the anchor elements.
Inventors
- 👤 J Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:20
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/06; B65D33/10; B65D33/105; B31; B31B; B31B70/00; B31B70/74; B31B70/86; B31B70/864; B31B70/87; Y; Y10; Y10S; Y10S493/00; Y10S493/916; Y10S493/926; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1075; Y10T156/1077; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T156/1095
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A method of manufacturing plastics bags comprising the steps of: advancing in the longitudinal direction a relatively wide longitudinally folded strip of thermoplastic material, the plies of the strip on either side of the fold defining the front and rear walls of the bag; advancing in the same direction, adjacent the marginal part of at least one of the plies, a relatively narrow strip of thermoplastic material; advancing in the same direction handle loops, each loop having the ends thereof attached to a common anchor element, and inserting the handle loops between the adjacent ply and the narrow strip in an orientation such that the loop extends from the marginal part of the bag wall; welding the strip and the adjacent ply together to trap the anchor element; and welding the plies together along lines at right angles to the fold to complete the bag.
Claim 2
Independent Claim
145 words
A method of manufacturing plastics bags comprising the steps of: advancing in the longitudinal direction a relatively wide longitudinally folded strip of thermoplastic material, the plies of the strip on either side of the fold defining the front and rear walls of the bag; advancing in the same direction, adjacent the marginal part of at least one of the plies, a relatively narrow strip of thermoplastic material; advancing in the same direction handle loops, each loop having the ends thereof attached to a common anchor element, and inserting the handle loops between the adjacent ply and the narrow strip in an orientation such that the loop extends from the marginal part of the bag wall; welding the strip and the adjacent ply together to trap the anchor element; and welding the plies together along lines at right angles to the fold to complete the bag.
Claim 3
Dependent Claim
57 words
The method of claim 1 further comprising the steps of: advancing the handle loops in a continuous length; correctly positioning the leading handle loop of the length of the ply; severing the leading handle loop from the length; and feeding the narrow strip over the severed handle loop prior to welding the strip and the ply together.
Claim 4
Dependent Claim
28 words
The method of claim 2 including the step of tack welding the handle loop to the adjacent ply prior to welding of the ply and the narrow strip.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |