US3820658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self cleaning filter apparatus and system
Assignee: Dixie Water Treatment Co
•
Filing: 1972-07-05
•
Granted: 1974-06-28
•
Expires: 1992-07-05
Abstract
Abstract An intermittently operated pump passes waste fluid through a check valve into an upflow closed filter tank apparatus to produce clean fluid which may be used or discharged. When the pump stops a valve opens and the clean fluid then remaining in the tank is forcibly back washed by the air pressure in the tank through the filter material and through the valve back to a source. An adjustable pressure valve is in line with the clean fluid discharge and an air check valve passes air into the tank after each back washing occurrence. A float and switch controls actuation of the pump and the closing of the valve.
Inventors
- 👤 A Cruze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:53
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/48; B01D24/4884; B01D24/02; B01D24/10; B01D24/16; B01D24/165; B01D24/4869
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
288 words
In a filter system comprising a closed filter apparatus having an inlet chamber, a clean fluid chamber and filter material seParating said inlet chamber from said clean fluid chamber, a pump for pumping the waste fluid from a source to said inlet chamber, first fluid conduit means communicating between said pump and said inlet chamber, check valve means interposed in said first conduit means between said pump and said inlet chamber for establishing a one way fluid path toward said inlet chamber, a second fluid conduit means communicating with said inlet chamber for removing back wash fluid and the waste in the filter material, a selectively operated valve means in said second conduit means for controlling the flow of fluid and waste therethrough, means for intermittently activating and deactivating said pump and closing and opening said selectively operated valve means, said filter apparatus having an air chamber communicating with said clean fluid chamber and a discharge outlet communicating with said clean fluid chamber, a normally closed air tight fluid pressure responsive valve means in communication with said discharge outlet and automatically opening to permit egress of clean fluid produced by pumping the waste fluid through the filter material out through said discharge outlet when the pressure in said clean fluid chamber reaches a predetermined pressure, said means for intermittently activating and deactivating said pump being operable to deactivate said pump and open said selectively operated valve means, the air in the air chamber and the clean fluid remaining in said clean fluid chamber forcibly back washing the filter material upon deactivation of said pump with the back wash fluid and the waste in the filter material passing through said second conduit means and open selectively operated valve means.
Claim 2
Dependent Claim
288 words
In a filter system comprising a closed filter apparatus having an inlet chamber, a clean fluid chamber and filter material seParating said inlet chamber from said clean fluid chamber, a pump for pumping the waste fluid from a source to said inlet chamber, first fluid conduit means communicating between said pump and said inlet chamber, check valve means interposed in said first conduit means between said pump and said inlet chamber for establishing a one way fluid path toward said inlet chamber, a second fluid conduit means communicating with said inlet chamber for removing back wash fluid and the waste in the filter material, a selectively operated valve means in said second conduit means for controlling the flow of fluid and waste therethrough, means for intermittently activating and deactivating said pump and closing and opening said selectively operated valve means, said filter apparatus having an air chamber communicating with said clean fluid chamber and a discharge outlet communicating with said clean fluid chamber, a normally closed air tight fluid pressure responsive valve means in communication with said discharge outlet and automatically opening to permit egress of clean fluid produced by pumping the waste fluid through the filter material out through said discharge outlet when the pressure in said clean fluid chamber reaches a predetermined pressure, said means for intermittently activating and deactivating said pump being operable to deactivate said pump and open said selectively operated valve means, the air in the air chamber and the clean fluid remaining in said clean fluid chamber forcibly back washing the filter material upon deactivation of said pump with the back wash fluid and the waste in the filter material passing through said second conduit means and open selectively operated valve means.
Claim 3
Dependent Claim
36 words
In the system as defined in claim 1 further comprising an air control valve means communicating with said filter apparatus for passing air into said air chamber of said filter apparatus after each back washing occurrence.
Claim 4
Dependent Claim
20 words
In the system as defined in claim 1 wherein the filter material includes a gravel bed and a sand bed.
Claim 5
Dependent Claim
32 words
In the system as defined in claim 1 wherein said air tight fluid pressure responsive valve means includes a valve and means to adjust said valve to open under various fluid pressures.
Claim 6
Dependent Claim
25 words
In the system as defined in claim 1 wherein said air tight fluid pressure responsive valve means includes a spring loaded fluid pressure relief valve.
Claim 7
Dependent Claim
34 words
In the system as defined in claim 1 wherein said first and second conduit means communicate with each other with said check valve means preventing any back wash fluid from passing into said pump.
Claim 8
Dependent Claim
36 words
In the system as defined in claim 1 wherein said filter apparatus is an upflow filter apparatus, said first and second conduit means communicating with said inlet chamber of said filter apparatus adjacent the bottom thereof.
Claim 9
Dependent Claim
28 words
In the system as defined in claim 7 wherein said discharge outlet communicates with said clean fluid chamber of said filter apparatus above the filter material level therein.
Claim 10
Dependent Claim
30 words
In the system as defined in claim 7 wherein said filter apparatus includes means disposed in said inlet chamber for distributing the waste fluid inflow beneath the filter material therein.
Claim 11
Dependent Claim
37 words
In the system as defined in claim 1 further comprising a sump fluidly communicating between said source and said pump, said means for intermittently activating and deactivating including means responsive to a predetermined condition of said sump.
Claim 12
Dependent Claim
49 words
In the system as defined in claim 10 wherein said selectively operated valve means includes a normally open hydraulic valve and a spring loaded solenoid for operating said valve, said means responsive to a predetermined condition of said sump includes an electrical float switch in series with said solenoid.
Claim 13
Dependent Claim
56 words
In the system as defined in claim 10 wherein said pump is an electrical motor driven pump, said means responsive to a predetermined condition of said sump includes a float member within said sump and an electrical switch operated by said float member, said switCh being electrically connected to said pump for activating and deactivating same.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |