US4936984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Consumer water filtering apparatus
Assignee: Individual
•
Filing: 1989-02-08
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Granted: 1990-06-26
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Expires: 2009-02-08
Abstract
Abstract A water-filtering apparatus comprising two substantially identical containers each with a water-dispensing valve on the side near the bottom, and a hole in the top. A filter is rested in the hole of the first of the containers. The second container is filled through its hole with water, elevated by some means such as a table or box above the first container, and the water is allowed to flow out of the upper valve, through the filter and into the lower container.
Inventors
- 👤 Mary Jane Blandford
- 👤 Robert R. Blandford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/283; C02F1/001; C02F1/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
An inexpensive, convenient, and simple invention for filtering water, comprising two substantially equal and interchangeable containers, each with a water-dispensing valve on a side near the bottom, said valves extending below the bottom of the respective containers, each container also having a hole on top, through which water may enter, a filter first structured to rest in the hole of a first, lower, container, a second upper container, means to support said upper container above said lower container and means to ensure air leaks in both containers so that water is driven by gravity out said valve of said upper container, through said filter, and into said lower container.
Claim 2
Dependent Claim
109 words
An inexpensive, convenient, and simple invention for filtering water, comprising two substantially equal and interchangeable containers, each with a water-dispensing valve on a side near the bottom, said valves extending below the bottom of the respective containers, each container also having a hole on top, through which water may enter, a filter first structured to rest in the hole of a first, lower, container, a second upper container, means to support said upper container above said lower container and means to ensure air leaks in both containers so that water is driven by gravity out said valve of said upper container, through said filter, and into said lower container.
Claim 3
Dependent Claim
43 words
The invention of claim 1 wherein sealing means are provided for the first holes of said containers and wherein a second hole, is located on top each container, to provide an air leak into the containers with the sealing means being in place.
Claim 4
Dependent Claim
43 words
The invention of claim 1 wherein sealing means are provided for the first holes of said containers and wherein a small hole is present in said sealing means to provide an air leak into the containers with the sealing means being in place.
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |