Patent US4253581A successfully refreshed from Google Patents.
US4253581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container with screw cap
Assignee: Albert Obrist AG
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Filing: 1979-01-12
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Granted: 1981-03-03
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Expires: 1999-01-12
Abstract
Abstract A container having an external screw thread is closed by a synthetic plastics stopper comprising an internally threaded cap with a seal part protruding from the cap top, this seal part having an outwardly protruding seal section which in use is bent back outwardly by the inner wall of the container neck. The screw thread on the container neck, the screw thread on the cap and the seal section are such in relation to one another that in applying the stopper the seal section contacts the container neck and is bent back thereby before the external screw thread on the container and the internal thread on the cap come into engagement with one another. The seal section preferably consists of permanently deformable material so that on unscrewing the stopper, the seal between the stopper and the container opening is broken before the threads come out of engagement.
Inventors
- 👤 Dietmar Aichinger
- 👤 Albert Obrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:53
CPC Classifications
B; B65; B65D; B65D41/00; B65D41/02; B65D41/04; B65D41/0407; B65D41/0414; Y; Y10; Y10S; Y10S215/00; Y10S215/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
249 words
In the combination of a pressurized container having an externally threaded neck and a synthetic plastics screw stopper comprising an internally threaded screw cap and an approximately cylindrical seal part protruding centrally from the cap top and having an outwardly projecting sealing lip of which the outside diameter, before application of the stopper to the container neck, is greater than the inside diameter of the container neck and which on application of the stopper to the container neck is bent back outwardly on itself and abuts in sealing manner with the cylindrical inner wall of the container neck, the improvement that the external screw-threading of the container neck, the internal threading of the screw cap, the seal part and the sealing lip are so formed in relation to one another that, at least when the screw stopper is applied to the container neck for the first time, the sealing lip engages the rim of the container neck and is at least partially bent back on itself thereby, before the internal screw-threading of the cap and the external threading of the container neck engage one another to an extent sufficient to prevent disengagement thereof by the internal pressure in the container, whereby, on unscrewing the stopper from the container neck, the sealing lip is disengaged from the container neck and releases the pressure in the container before the screw threads on the container neck and on the cap are disengaged to an extent allowing the stopper to be blown off.
Claim 2
Dependent Claim
249 words
In the combination of a pressurized container having an externally threaded neck and a synthetic plastics screw stopper comprising an internally threaded screw cap and an approximately cylindrical seal part protruding centrally from the cap top and having an outwardly projecting sealing lip of which the outside diameter, before application of the stopper to the container neck, is greater than the inside diameter of the container neck and which on application of the stopper to the container neck is bent back outwardly on itself and abuts in sealing manner with the cylindrical inner wall of the container neck, the improvement that the external screw-threading of the container neck, the internal threading of the screw cap, the seal part and the sealing lip are so formed in relation to one another that, at least when the screw stopper is applied to the container neck for the first time, the sealing lip engages the rim of the container neck and is at least partially bent back on itself thereby, before the internal screw-threading of the cap and the external threading of the container neck engage one another to an extent sufficient to prevent disengagement thereof by the internal pressure in the container, whereby, on unscrewing the stopper from the container neck, the sealing lip is disengaged from the container neck and releases the pressure in the container before the screw threads on the container neck and on the cap are disengaged to an extent allowing the stopper to be blown off.
Claim 3
Dependent Claim
38 words
The combination as defined in claim 1, in which the seal lip consists of a material which, after deformation by insertion in the container neck, remains in the deformed condition at least temporarily when removed from said neck.
Claim 4
Dependent Claim
34 words
The combination as defined in claim 1 in which, on unscrewing the cap, the bent-back lip is disengaged from the container neck before engagement of the screw threads is less than one half turn.
Claim 5
Dependent Claim
22 words
The combination as defined in claim 1, in which the seal part is thickened between the seal lip and the cap top.
Claim 6
Dependent Claim
89 words
A method of fitting a plastics screw cap with a deformable internal sealing lip on to a container to provide the combination claimed in claim 1, which comprises aligning the screw cap with the container neck, pressing the screw cap on to the container neck with sufficient force to deform the sealing lip by engagement with the neck of the container until the screw threads are in a position for engagement by relative rotation and then screwing the cap on to the container neck to engage the threads fully.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |