US5186830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water filtration apparatus
Assignee: Individual
•
Filing: 1991-05-31
•
Granted: 1993-02-16
•
Expires: 2011-05-31
Abstract
Abstract Abstract for filtering drinking water which includes a lower non-porous container to receive the filtrate. An upper filter vessel closed at its lower end by a high density ceramic filter is stacked in nested relationship to the lower container. When water containing contaminants and pollutants is poured into the filter vessel, it drips through the ceramic filter under gravitational forces and is stored in the lower receptacle.
Inventors
- 👤 Joseph M. Rait
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:19
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; B; B01; B01D; B01D29/00; B01D29/01; B01D29/03; B01D29/085; C02F2307/00; C02F2307/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
Apparatus for filtering water to eliminate contaminants comprising in combination a pair of vertically stacked containers including an upper filtering vessel and a lower receptacle in nested relationship, said upper filtering vessel being closed at its lower end by a microporous filter unit, said microporous filtering unit comprising a fired ceramic filter element incorporating silver salts and overlying in juxtaposition a carbon filter element, and a plurality of beads of ion exchange resins positioned between the said filter elements.
Claim 2
Dependent Claim
79 words
Apparatus for filtering water to eliminate contaminants comprising in combination a pair of vertically stacked containers including an upper filtering vessel and a lower receptacle in nested relationship, said upper filtering vessel being closed at its lower end by a microporous filter unit, said microporous filtering unit comprising a fired ceramic filter element incorporating silver salts and overlying in juxtaposition a carbon filter element, and a plurality of beads of ion exchange resins positioned between the said filter elements.
Claim 3
Dependent Claim
14 words
A filter unit according to claim 1 wherein said carbon element includes calcium carbonate.
Claim 4
Dependent Claim
32 words
A filter unit according to claim 1 wherein said carbon element includes a recess in its surface adjacent said ceramic element, said beads of ion exchange resins being contained in said recess.
Claim 5
Dependent Claim
14 words
A filter unit according to claim 1 wherein said carbon element contains manganese dioxide.
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) | 1996-02-16 | 1996-08-17 | 1997-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-16 | 2000-08-17 | 2001-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-16 | 2004-08-17 | 2005-02-16 | $7700.00 | Window Closed / Lapsed |