US4542530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible container with resealable opening
Assignee: Wrightcel Ltd
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Filing: 1982-01-04
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Granted: 1985-09-17
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Expires: 2002-01-04
Abstract
Abstract A flexible container for the storage of liquids which incorporates a resealable opening. A flap is temporarily sealed over the opening of the unfilled flexible container. When the container is filled this temporary seal is broken and after filling a permanent heat seal is formed by applying heat externally to the flexible container. The flap is heat sealable on the surface contacting the opening in the container wall but non-heat-sealable on its opposite surface. The temporary seal is preferably a heat activated or pressure sensitive coating which has a low cohesion with the opening of the flexible container wall.
Inventors
- 👤 Geoffrey Thomas
- 👤 Charalambos G. Kalkipsakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:52
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/52; B65D75/58; B65D75/5861; B65D75/5872; B65D75/5877; A; A61; A61J; A61J1/00; A61J1/05; A61J1/10; A61J1/14; A61J1/1406; A61J1/1475
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
214 words
A flexible container comprising: (a) a collar affixed by a flange to a wall of said flexible container, said collar providing an opening into said flexible container for filling said container and for receiving a dispensing means after said container is filled; and, (b) a flap attached within said flexible container, said attachment being to or near said flange, so that said flap is over said opening in said collar and a fluid tight seal over said opening can be made, said flap including: (i) a first surface region which can be brought into contact with said flange, said flange including a first region for providing a temporary seal around said opening with said first surface region on said flap; (ii) a second surface region which can be brought into contact with said flange, said flange including a second region for providing a fluid tight heat seal around said opening with said second surface region on said flap when heat is applied outside said flexible container in the region of said flap; and, (iii) a second non-heat sealable surface facing away from said collar so that said flap will not be heat sealed to the interior of said flexible container when heat is applied outside said flexible container in the region of said flap.
Claim 2
Dependent Claim
214 words
A flexible container comprising: (a) a collar affixed by a flange to a wall of said flexible container, said collar providing an opening into said flexible container for filling said container and for receiving a dispensing means after said container is filled; and, (b) a flap attached within said flexible container, said attachment being to or near said flange, so that said flap is over said opening in said collar and a fluid tight seal over said opening can be made, said flap including: (i) a first surface region which can be brought into contact with said flange, said flange including a first region for providing a temporary seal around said opening with said first surface region on said flap; (ii) a second surface region which can be brought into contact with said flange, said flange including a second region for providing a fluid tight heat seal around said opening with said second surface region on said flap when heat is applied outside said flexible container in the region of said flap; and, (iii) a second non-heat sealable surface facing away from said collar so that said flap will not be heat sealed to the interior of said flexible container when heat is applied outside said flexible container in the region of said flap.
Claim 3
Dependent Claim
29 words
A flexible container as claimed in claim 1 in which the temporary seal between said flap and said flange is made with a peelable polymer layer having low adhesion.
References Cited (Backward Citations)
US3642047A
Cited
US4257535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |