Patent US5453189A successfully refreshed from Google Patents.
US5453189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter insert for containers
Assignee: Pi Design AG
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Filing: 1993-07-30
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Granted: 1995-09-26
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Expires: 2013-07-30
Abstract
Abstract A filter insert for containers, such as tea pots, where a specific dwelling time is required for the filter pulp in the liquid held in the container, the insert consisting of a circular cylindrical filter unit, extending downwards from the top of the container at to least below the surface of the liquid in the container when being filled, and where at least one plunger shaft with a plunger sliding in a plunger guide extends axially through the upper part of the insert. The plunger is provided with a rim flange and can be moved to the bottom of the filter insert which is divided in at least two sections, a bottom part and a top part where the bottom part consists of a material, for instance plastic, which is impermeable to the liquid, and the top part mainly consists of a material permeable to the liquid, for instance a wire screen which can keep the filter pulp, and where the plunger also is impermeable and vaulted upwards, so that the central height is greater than the height at the circumference which is provided with an upright rim flange.
Inventors
- 👤 Carsten Joergensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:10
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/18; A47J31/20; A47G; A47G19/00; A47G19/12; A47G19/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
197 words
A filter insert for a liquid container where a specific dwelling time is to be maintained for filter pulp in said liquid, said insert is adapted to be inserted into said container, said inset being divided into an upper part for holding said filter pulp connected to a bottom part,said upper part comprising a downward extending cylindrical filter unit adapted to extend below the surface of said liquid, said filter insert further comprising a plunger attached to a plunger shaft, said plunger shaft being slidably disposed in a plunger and said plunger being slideably mounted in said cylindrical filter unit, said plunger shaft extends axially through the plunger shaft guide in said upper part of said insert, said plunger being provided with a circumferential rim flange and said plunger with said rim flange can be moved to the bottom part of the filter insert, said bottom part of the filter insert and said plunger being impermeable to said liquid and said upper part of the filter insert comprising the filter unit being permeable to said liquid, said plunger being centrally valted upward so that its central height is greater than the height of said circumferential rim flange.
Claim 2
Dependent Claim
197 words
A filter insert for a liquid container where a specific dwelling time is to be maintained for filter pulp in said liquid, said insert is adapted to be inserted into said container, said inset being divided into an upper part for holding said filter pulp connected to a bottom part,said upper part comprising a downward extending cylindrical filter unit adapted to extend below the surface of said liquid, said filter insert further comprising a plunger attached to a plunger shaft, said plunger shaft being slidably disposed in a plunger and said plunger being slideably mounted in said cylindrical filter unit, said plunger shaft extends axially through the plunger shaft guide in said upper part of said insert, said plunger being provided with a circumferential rim flange and said plunger with said rim flange can be moved to the bottom part of the filter insert, said bottom part of the filter insert and said plunger being impermeable to said liquid and said upper part of the filter insert comprising the filter unit being permeable to said liquid, said plunger being centrally valted upward so that its central height is greater than the height of said circumferential rim flange.
Claim 3
Dependent Claim
31 words
A filter insert according to claim 1, wherein the upper part (3) consists of said filter unit (3a) and lid part (6), in which the plunger shaft guide (7) is disposed.
Claim 4
Dependent Claim
19 words
A filter insert according to claim 1 wherein the upper part (3) comprises a lid for said liquid container.
Claim 5
Dependent Claim
34 words
A filter insert according to claim 2 wherein the upper part of the filter insert (1) is made with a releasable connection both to the bottom part (2) and to the lid part (6).
Claim 6
Dependent Claim
47 words
Filter insert according to claim 2 wherein the permeable upper part (3a) of the filter insert (1) is provided with a section (3b) provided with grip-means (8) which mates with corresponding grip-means (9) in the corresponding part of the bottom part (2) or the lid part (6).
Claim 7
Dependent Claim
15 words
A filter insert according to claim 5, wherein the gripping means (8) are screw threads.
Claim 8
Dependent Claim
15 words
A filter insert according to claim 5, wherein the gripping means (8) are bayonet sockets.
Claim 9
Dependent Claim
15 words
A filter insert according to claim 5, wherein the gripping means (8) are as snaplocks.
Claim 10
Dependent Claim
20 words
The filter insert of claim 1 wherein said bottom part (2) is plastic and said filter unit is a screen.
Claim 11
Dependent Claim
12 words
The filter insert of claim 5 wherein said section (3b) is plastic.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-25 | 1999-03-27 | 1999-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-25 | 2003-03-27 | 2003-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-25 | 2007-03-27 | 2007-09-26 | $7700.00 | Window Closed / Lapsed |