Patent US3744639A successfully refreshed from Google Patents.
US3744639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable water purifier
Assignee: Individual
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Filing: 1971-03-16
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Granted: 1973-07-10
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Expires: 1991-03-16
Abstract
Abstract A filter assembly comprises a substantially flat, foldable container having a liquid inlet and a liquid outlet; and, particulate filtering media in the path of liquid flow in the container between the inlet and outlet. The container may define an elongated duct, with flexible flow regulator means therein to control flow through multiple compartments.
Inventors
- 👤 G Teeple
- 👤 J Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; B; B01; B01D; B01D24/00; B01D24/02; B01D24/10; B01D24/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
In a filter assembly, the combination comprising a. an elongated upright substantially flat, foldable container having a liquid inlet and a liquid outlet, said container consisting of sheet plastic defining a first duct, b. particulate filtering media in the path of liquid flow in the first duct between said inlet and outlet, c. there being a manually manipulable closure carried by the first duct proximate said outlet to control drainage of liquid from the container, the lowermost portion of the first duct tapering downwardly toward said outlet which is directed downwardly at the lower end of the container, and said closure located at said tapered portion of the first duct, and d. a second duct consisting of foldable sheet plastic material, the second duct havinG liquid inlet and outlet end portions, a porous filter carried within the second duct and at said outlet end portion thereof, the second duct having opposite flat sides which are joined together to define a sediment trap within the lowermost portion of the second duct and proximate to but outside the porous filter and the second duct outlet end portion being removably telescopically received in the first duct above the level of said filtering media.
Claim 2
Dependent Claim
200 words
In a filter assembly, the combination comprising a. an elongated upright substantially flat, foldable container having a liquid inlet and a liquid outlet, said container consisting of sheet plastic defining a first duct, b. particulate filtering media in the path of liquid flow in the first duct between said inlet and outlet, c. there being a manually manipulable closure carried by the first duct proximate said outlet to control drainage of liquid from the container, the lowermost portion of the first duct tapering downwardly toward said outlet which is directed downwardly at the lower end of the container, and said closure located at said tapered portion of the first duct, and d. a second duct consisting of foldable sheet plastic material, the second duct havinG liquid inlet and outlet end portions, a porous filter carried within the second duct and at said outlet end portion thereof, the second duct having opposite flat sides which are joined together to define a sediment trap within the lowermost portion of the second duct and proximate to but outside the porous filter and the second duct outlet end portion being removably telescopically received in the first duct above the level of said filtering media.
Claim 3
Dependent Claim
30 words
The combination of claim 1 wherein the sheet plastic ducts are adapted to be expanded by water flowing therethrough, there being means in the first duct to restrict said flow.
Claim 4
Dependent Claim
19 words
The combination of claim 1 including a flexible flow regulator in the first duct in said liquid flow path.
Claim 5
Dependent Claim
14 words
The combination of claim 3 wherein said regulator consists of a flexible porous body.
Claim 6
Dependent Claim
39 words
The combination of claim 4 wherein said body is downstream of said filtering media, and including a second flexible porous body upstream of said media, said bodies blocking escape of the media from the interior of the first duct.
Claim 7
Dependent Claim
13 words
The combination of claim 5 wherein said media consists of activated charcoal granules.
Claim 8
Dependent Claim
29 words
The combination of claim 1 wherein said media consists of activated charcoal granules in one zone in said path, and de-ionizing resin particles in another zone in said path.
Claim 9
Dependent Claim
25 words
The combination of claim 7 including flexible porous plastic sponge means retained in the first duct to block escape of said media from said zones.
Claim 10
Dependent Claim
22 words
The combination of claim 4 wherein said regulator body has an irregular entrance end to substantially increase the particle entrapping surface area.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |