US5811004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water filtration cartridge
Assignee: Syratech Corp
•
Filing: 1996-09-06
•
Granted: 1998-09-22
•
Expires: 2016-09-06
Abstract
Abstract A reservoir of a water filtration system carries a projection such as a fin on its outer surface. The reservoir is removably received in a housing, such as a pitcher, such that the projection engages a shelf in the housing. A passage in the reservoir can have a nonuniform taper that corresponds to the outer surface of a water filtration cartridge. A grippable member such as an indicator dial can be movably attached to the outer surface of the housing. For each orientation, use indicia on the grippable member align with use indicia on the outer surface of the housing in a unique visual configuration. A water filter cartridge for the filtration system can have an inner surface that extends between a water inlet and a water outlet. One portion of the inner surface starts at the water inlet and joins at its other end to a second portion of the inner surface. The second portion of the inner surface is about as long as the first portion, and is tapered. The small-diameter end of the tapered portion extends to the water outlet of the filter cartridge. The cartridge can also have two ridges on the inner surface of the housing between the water inlet and outlet, both projecting inward towards the center axis of the housing. The innermost end of the ridge closest to the water inlet is farther from the center axis than the innermost end of the other ridge.
Inventors
- 👤 Edward J. Robertson
- 👤 Mark Florence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:18
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; C02F2201/00; C02F2201/002; C02F2201/006; C02F2307/00; C02F2307/04
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
185 words
A water filter cartridge comprising: a housing having first and second ends and an inner surface, the inner surface defining an interior region disposed along a central axis extending between the first and second ends of the housing; a water inlet defined in a wall of the housing and opening into the interior region of the housing; a water outlet defined in a wall of the housing opening into the interior region of the housing; a first ridge defined by the inner surface of the housing between the water inlet and the water outlet, the first ridge projecting inwardly towards the central axis and terminating at an innermost end, the innermost end of the first ridge being disposed a first distance from the central axis, and a second ridge adjacent the first ridge defined by the inner surface of the housing between the first ridge and the water outlet, the second ridge projecting inwardly towards the central axis and terminating at an innermost end, the innermost end of the second ridge being disposed a second distance less than the first distance from the central axis.
Claim 2
Dependent Claim
185 words
A water filter cartridge comprising: a housing having first and second ends and an inner surface, the inner surface defining an interior region disposed along a central axis extending between the first and second ends of the housing; a water inlet defined in a wall of the housing and opening into the interior region of the housing; a water outlet defined in a wall of the housing opening into the interior region of the housing; a first ridge defined by the inner surface of the housing between the water inlet and the water outlet, the first ridge projecting inwardly towards the central axis and terminating at an innermost end, the innermost end of the first ridge being disposed a first distance from the central axis, and a second ridge adjacent the first ridge defined by the inner surface of the housing between the first ridge and the water outlet, the second ridge projecting inwardly towards the central axis and terminating at an innermost end, the innermost end of the second ridge being disposed a second distance less than the first distance from the central axis.
Claim 3
Dependent Claim
64 words
The water filter cartridge of claim 1 further comprising: a third ridge defined by the inner surface of the housing between the second ridge and the water outlet, the third ridge projecting inwardly towards the central axis and terminating at an innermost end, the innermost end of the third ridge being disposed a third distance less than the second distance from the central axis.
Claim 4
Dependent Claim
20 words
The water filter cartridge of claim 1 wherein the first and second ridges are disposed immediately adjacent to one another.
Claim 5
Dependent Claim
28 words
The water filter cartridge of claim 1 wherein the inner surface is circular in cross-section along the central axis in a region including the first and second ridges.
Claim 6
Dependent Claim
22 words
The water filter cartridge of claim 4 wherein the first and second ridges extend around the full circumference of the inner surface.
Claim 7
Dependent Claim
22 words
The water filter cartridge of claim 1 wherein the first and second ridges are concentric with the central axis of the housing.
Claim 8
Dependent Claim
17 words
The water filter cartridge of claim 1 wherein the first ridge is parallel to the second ridge.
Claim 9
Dependent Claim
23 words
The water filter cartridge of claim 1 wherein the first and second ridges are disposed on a tapered region of the inner surface.
Claim 10
Dependent Claim
23 words
The water filter cartridge of claim 8 wherein the first and second ridges are disposed on a frustoconical region of the inner surface.
Claim 11
Dependent Claim
31 words
The water filter cartridge of claim 9 wherein the water outlet is disposed closer to a small-diameter end of the frustoconical region than to a large-diameter end of the frustoconical region.
Claim 12
Dependent Claim
23 words
The water filter cartridge of claim 9 wherein the inner surface includes a cylindrical region joined at one end to the frustoconical region.
Claim 13
Dependent Claim
41 words
The water filter cartridge of claim 1 further comprising an air vent defined in a wall of the housing and opening into the interior region of the housing, the water inlet being disposed between the air vent and the water outlet.
Claim 14
Dependent Claim
204 words
A water filter cartridge comprising: a housing having first and second ends and an inner surface, the inner surface defining an interior region disposed along a central axis extending between the first and second ends of the housing; a water inlet defined in a wall of the housing and opening into the interior region of the housing; and a water outlet defined in a wall of the housing and opening into the interior region to the housing; the inner surface of the housing comprising a first surface having first and second ends and a tapered surface having large-diameter and small-diameter ends, a taper of the tapered surface being greater than a taper of the first surface; a ridge defined by the inner surface of the housing disposed intermediate the large-diameter and small-diameter ends of the tapered surface; the first end of the first surface extending to the water inlet, and the small-diameter end of the tapered surface extending to the water outlet, the second end of the first surface being joined to the large-diameter end of the tapered surface; and the length of the first surface along the central axis being substantially equal to the length of the tapered surface along the central axis.
Claim 15
Dependent Claim
204 words
A water filter cartridge comprising: a housing having first and second ends and an inner surface, the inner surface defining an interior region disposed along a central axis extending between the first and second ends of the housing; a water inlet defined in a wall of the housing and opening into the interior region of the housing; and a water outlet defined in a wall of the housing and opening into the interior region to the housing; the inner surface of the housing comprising a first surface having first and second ends and a tapered surface having large-diameter and small-diameter ends, a taper of the tapered surface being greater than a taper of the first surface; a ridge defined by the inner surface of the housing disposed intermediate the large-diameter and small-diameter ends of the tapered surface; the first end of the first surface extending to the water inlet, and the small-diameter end of the tapered surface extending to the water outlet, the second end of the first surface being joined to the large-diameter end of the tapered surface; and the length of the first surface along the central axis being substantially equal to the length of the tapered surface along the central axis.
Claim 16
Dependent Claim
32 words
The water filter cartridge of claim 13 wherein the diameter of the second end of the first surface is substantially equal to the diameter of the large-diameter end of the tapered surface.
Claim 17
Dependent Claim
15 words
The water filter cartridge of claim 13 wherein the first surface comprises a cylindrical surface.
Claim 18
Dependent Claim
15 words
The water filter cartridge of claim 13 wherein the tapered surface comprises a frustoconical surface.
Claim 19
Dependent Claim
34 words
The water filter cartridge of claim 13 wherein the housing comprises a cap at the first end of the first surface, and wherein the water inlet is defined in a wall of the cap.
Claim 20
Dependent Claim
24 words
The water filter cartridge of claim 13 wherein the water outlet is defined in a wall at the small-diameter end of the tapered surface.
References Cited (Backward Citations)
US103592A
Cited
US795408A
Cited
US2805561A
Cited
US3374897A
Cited
US3554377A
Cited
US3747767A
Cited
US3861565A
Cited
US4199449A
Cited
US4196081A
Cited
US4306971A
Cited
US4430226A
Cited
US4556484A
Cited
US4606823A
Cited
US4653671A
Cited
US4666600A
Cited
US4623457A
Cited
US4759844A
Cited
US4693823A
Cited
US4885089A
Cited
US4749484A
Cited
US4894154A
Cited
USD322401S
Cited
USD320935S
Cited
USD319186S
Cited
USD325768S
Cited
USD318095S
Cited
US4826594A
Cited
USD312863S
Cited
US4969996A
Cited
US4895648A
Cited
US4913808A
Cited
US5049272A
Cited
US5110479A
Cited
US5009364A
Cited
US5076912A
Cited
US5114570A
Cited
US5106501A
Cited
USD335608S
Cited
US4986901A
Cited
US4978449A
Cited
USD336760S
Cited
USD337691S
Cited
USD337760S
Cited
US5076922A
Cited
US5238559A
Cited
USD331446S
Cited
US5149437A
Cited
US5190643A
Cited
US5225078A
Cited
US5271837A
Cited
US5486285A
Cited
USD370711S
Cited
US5536396A
Cited
USD374911S
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |