Patent US4804467A successfully refreshed from Google Patents.
US4804467A
Expired / Lapsed
US
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Water filter assembly
Assignee: Hurley Chicago Co Inc
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Filing: 1987-09-03
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Granted: 1989-02-14
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Expires: 2007-09-03
Abstract
Abstract A portable water filter assembly is provided with a filter canister secured to a removable base unit to permit replacement and cleaning of the filter elements. The base is sealingly secured to the canister to prevent any leakage through the use of a sealing device. A tamper-proof fitting at the water supply connection serves to prevent servicing of the unit and changing the filter element by other than qualified personnel.
Inventors
- 👤 Gus Losos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:15
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A water filter including a canister portion for holding filter elements and granular activated carbon said canister portion including tap connection means, an external base element, an internal base element, means for sealing the internal base element with the canister, supply line connecting means, and lock means for receiving a key and for locking said inner base element to prevent removal thereof without said key
Claim 2
Dependent Claim
65 words
A water filter including a canister portion for holding filter elements and granular activated carbon said canister portion including tap connection means, an external base element, an internal base element, means for sealing the internal base element with the canister, supply line connecting means, and lock means for receiving a key and for locking said inner base element to prevent removal thereof without said key
Claim 3
Dependent Claim
45 words
The water filter of claim 1 further including securing means for said external base element to removably secure said internal base element and wherein said key-removable lock means comprises a key-removable lock for locking said external base element to prevent removable thereof without a key.
Claim 4
Dependent Claim
30 words
The water filter of claim 2 wherein said securing means comprises internal base member outer threads and external base member inner threads engagable with said internal base member outer threads.
Claim 5
Dependent Claim
64 words
The water filter of claim 3 wherein said internal base member includes a bore and said external base member includes an aperture alignable with said bore and wherein said key-removable lock comprises a removable fitting, said fitting including means for securing said lock to said internal base element and a keyway, said fitting extending through said bore and at least partially through said aperture.
Claim 6
Dependent Claim
32 words
The water filter of claim 4 wherein said means for securing said fitting to said internal base element comprises engagable threads disposed on the mating surfaces of said fitting and said bore.
Claim 7
Dependent Claim
17 words
The water filter of claim 5 wherein said fitting is disposed entirely within said outer base element.
Claim 8
Dependent Claim
28 words
The water filter of claim 6 wherein said fitting includes an aperture defining a conduit and wherein said fitting at least partially defines said supply line connection means.
References Cited (Backward Citations)
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US3447687A
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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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |