US3883025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaskets for container closures
Assignee: WR Grace and Co
•
Filing: 1974-04-03
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Granted: 1975-05-13
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Expires: 1994-04-03
Abstract
Abstract The invention relates to gaskets for container closures, e.g. bottle caps. The gaskets of the invention are seated in closures which are threaded or in which a thread can be formed when the closure is fitted onto the neck of the container. The gaskets are characterised by having a substantially flat central portion and an adjoining peripheral portion which at all points is of greater thickness than the central panel. The thickness of the peripheral portion increases continuously, stepwise or part-continuously and part-stepwise radially outwards to the skirt of the closure. The radial length (x) between the centre of the closure and the beginning of the peripheral portion is 0.25 to 0.45 times the diameter of the closure.
Inventors
- 👤 John Adrian Lancaster Jemmett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:14
CPC Classifications
B; B65; B65D; B65D41/00; B65D41/02; B65D41/04; B65D41/0435; B29; B29C; B29C70/00; B29C70/68; B29C70/78; B29C70/80; B29K; B29K2027/00; B29K2027/06; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/255
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
155 words
In a container closure, suitable for a container having a threaded neck, said closure having a top portion, an integral skirt which extends downwardly from the top portion and is adapted to be secured on the container by threads complementary to said threads on the container neck and a gasket within the closure which, considered in its configuration before the closure is closed onto the container, has a substantially flat central panel and a peripheral portion adjoining said panel at an adjoinment edge, the improvement which comprises a said peripheral portion having a thickness which is at all points greater than the thickness of the central panel and increases continuously, stepwise, or part-continuously and part-stepwise, radially outwards from the adjoinment point to the skirt of the closure, the radial length (x) between the centre of the closure and the adjoinment edge being from 25 to 45% of the maximum internal diameter of the closure (d).
Claim 2
Dependent Claim
155 words
In a container closure, suitable for a container having a threaded neck, said closure having a top portion, an integral skirt which extends downwardly from the top portion and is adapted to be secured on the container by threads complementary to said threads on the container neck and a gasket within the closure which, considered in its configuration before the closure is closed onto the container, has a substantially flat central panel and a peripheral portion adjoining said panel at an adjoinment edge, the improvement which comprises a said peripheral portion having a thickness which is at all points greater than the thickness of the central panel and increases continuously, stepwise, or part-continuously and part-stepwise, radially outwards from the adjoinment point to the skirt of the closure, the radial length (x) between the centre of the closure and the adjoinment edge being from 25 to 45% of the maximum internal diameter of the closure (d).
Claim 3
Dependent Claim
57 words
Its thickness over at least part of its radial length from the adjoinment point to the skirt of the closure increases towards the skirt with a constant gradient, and any remaining part of said peripheral portion consists of a flat part adjoining the skirt and in a substantially pArallel plane to the plane of said central panel;
Claim 4
Dependent Claim
57 words
Its thickness over at least part of its radial length from the adjoinment point to the skirt of the closure increases towards the skirt with a constant gradient, and any remaining part of said peripheral portion consists of a flat part adjoining the skirt and in a substantially pArallel plane to the plane of said central panel;
Claim 5
Dependent Claim
22 words
A closure according to claim 1 wherein the said increase of thickness is continuous radially outwards to the skirt of the closure.
Claim 6
Dependent Claim
18 words
A closure according to claim 1 wherein the peripheral portion of the gasket includes a stepped skirt portion.
Claim 7
Dependent Claim
23 words
Said gradient of the peripheral portion defines an acute angle ( Beta ) with said central panel, within the range 20* to 50*;
Claim 8
Dependent Claim
23 words
Said gradient of the peripheral portion defines an acute angle ( Beta ) with said central panel, within the range 20* to 50*;
Claim 9
Dependent Claim
26 words
The radial length of any said flat part of the peripheral portion is 5 to 20% of the total radial length of the peripheral portion; and
Claim 10
Dependent Claim
26 words
The radial length of any said flat part of the peripheral portion is 5 to 20% of the total radial length of the peripheral portion; and
Claim 11
Dependent Claim
21 words
A closure according to claim 3 wherein the skirt portion consists of a single step adjoining the skirt of the closure.
Claim 12
Dependent Claim
20 words
A closure according to claim 3 wherein the said increase of thickness is continuous radially outwards to the skirt portion.
Claim 13
Dependent Claim
25 words
The radial length between the centre of said closure and the adjoinment edge is from 25 to 45% of the internal diameter of the closure.
Claim 14
Dependent Claim
25 words
The radial length between the centre of said closure and the adjoinment edge is from 25 to 45% of the internal diameter of the closure.
Claim 15
Dependent Claim
29 words
A closure according to claim 2 wherein the acute angle ( Beta ) between the slope of the peripheral portion and the central panel is from 20* to 80*.
Claim 16
Dependent Claim
29 words
A closure according to claim 5 wherein the acute angle ( Beta ) between the slope of the peripheral portion and the central panel is from 20* to 80*.
Claim 17
Dependent Claim
24 words
A closure according to claim 2, wherein the increase of thickness has a constant gradient, thereby producing a planar slope to said peripheral portion.
Claim 18
Dependent Claim
24 words
A closure according to claim 5, wherein the increase of thickness has a constant gradient, thereby producing a planar slope to said peripheral portion.
Claim 19
Dependent Claim
14 words
A closure according to claim 1 wherein x is 37 to 42% of d.
Claim 20
Dependent Claim
88 words
In combination, a container closure selected from closures having an internal thread therein and those which are threadable in situ on the container, a circular top portion to said closure, an integral skirt to said closure extending downwardly from said top portion, and, seated within said closure, a gasket which, considered in its configuration before the closure is closed onto the container, comprises a substantially flat central panel and a peripheral portion adjoining said panel at an adjoinment edge, wherein said peripheral portion has the following configurational characteristics:
Claim 21
Dependent Claim
88 words
In combination, a container closure selected from closures having an internal thread therein and those which are threadable in situ on the container, a circular top portion to said closure, an integral skirt to said closure extending downwardly from said top portion, and, seated within said closure, a gasket which, considered in its configuration before the closure is closed onto the container, comprises a substantially flat central panel and a peripheral portion adjoining said panel at an adjoinment edge, wherein said peripheral portion has the following configurational characteristics:
References Cited (Backward Citations)
US3828963A
Cited
US3749272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |