US4073429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics bag
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-06-21
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Granted: 1978-02-14
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Expires: 1996-06-21
Abstract
Abstract A plastics-film bag having one wall formed by overlapping panels joined by a longitudinal seal, and having a filling valve constituted by a passageway left between the panels, in which at least one additional layer of film or other flexible material is included between the panels in the overlap, to improve the security of the valve.
Inventors
- 👤 Norman E. Lawes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:29
CPC Classifications
B; B65; B65D; B65D31/00; B65D31/14; B65D31/147
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
206 words
A valved bag formed from a length comprising two plies of plastics film, the length being folded and joined to provide a bag having one wall formed by overlapping panels, the ends of the bag being closed and the overlapping panels being joined together by a longitudinal seal located along the edge region of the outer panel, the longitudinal seal being interrupted to provide a valve opening with transverse seals at each side of the valve opening defining a passageway constituting a filling valve between the panels, the outer panel comprising the two plies with their edges coextensive and the inner panel comprising the two plies together with at least one layer of flexible material in addition to said two plies at least throughout the valve region, the two plies and the additional layer which comprise the inner panel being arranged with their edges staggered such that all three edges may contact the inner ply of the outer panel, the additional layer being joined to the two plies of the inner panel at least by the transverse seals and being located with at least one of the plies of the inner panel lying between the additional layer and the outer panel in the area of overlap.
Claim 2
Dependent Claim
206 words
A valved bag formed from a length comprising two plies of plastics film, the length being folded and joined to provide a bag having one wall formed by overlapping panels, the ends of the bag being closed and the overlapping panels being joined together by a longitudinal seal located along the edge region of the outer panel, the longitudinal seal being interrupted to provide a valve opening with transverse seals at each side of the valve opening defining a passageway constituting a filling valve between the panels, the outer panel comprising the two plies with their edges coextensive and the inner panel comprising the two plies together with at least one layer of flexible material in addition to said two plies at least throughout the valve region, the two plies and the additional layer which comprise the inner panel being arranged with their edges staggered such that all three edges may contact the inner ply of the outer panel, the additional layer being joined to the two plies of the inner panel at least by the transverse seals and being located with at least one of the plies of the inner panel lying between the additional layer and the outer panel in the area of overlap.
Claim 3
Dependent Claim
28 words
A valved bag as claimed in claim 1 in which the additional layer of flexible material extends longitudinally from one closed end of the bag to the other.
Claim 4
Dependent Claim
59 words
A valved bag as claimed in claim 1 in which the additional layer of flexible material lies with one of its edges between said two plies of film of the inner panel and with its other edge projecting beyond the egde of the outer ply, but lying short of the edge of the inner ply, of the inner panel.
Claim 5
Dependent Claim
18 words
A valved bag as claimed in claim 3 in which said outer panel is edged by a fold.
Claim 6
Dependent Claim
34 words
A valved bag as claimed in claim 3 in which the edge of said inner ply of the inner panel is joined to the outer panel by a second longitudinal seal between the panels.
Claim 7
Dependent Claim
51 words
A valved bag as claimed in claim 1 in which two said additional layers of flexible material are provided by a J-folded strip of the material, the margin thereof that contains the fold being joined into said longitudinal seal and the two free edges thereof projecting unequally into the valve passageway.
Claim 8
Dependent Claim
31 words
A valved bag as claimed in claim 1 in which each said additional layer of flexible material is of smooth-surfaced plastics film thinner than the overall thickness of the bag wall.
Claim 9
Dependent Claim
20 words
A valved bag as claimed in claim 1 in which said additional layer or layers of flexible material are air-permeable.
Claim 10
Dependent Claim
36 words
A valved bag as claimed in claim 1, formed from a length comprising at least one layer of a plastics film and at least one layer of a different plastics film or of another flexible material.
Claim 11
Dependent Claim
20 words
A package comprising a valved bag as claimed in claim 1 and a liquid or a flowable semi-solid contained therein.
References Cited (Backward Citations)
CA709244A
Cited
US2040338A
Cited
BE650048A
Cited
DE1436858A1
Cited
DE2213908A1
Cited
US3833166A
Cited
US3812769A
Cited
US3746246A
Cited
GB1401713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |