US3154485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for filtering liquids
Assignee: Yarrow and Co Ltd
•
Filing: 1960-11-02
•
Granted: 1964-10-27
•
Expires: 1980-11-02
Abstract
No abstract record available.
Inventors
- 👤 Liddell Robert Emond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:53
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/12; B01D29/00; B01D29/11; B01D29/114; B01D29/62; B01D29/66; B01D29/88; B01D29/92; B01D29/925; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7313; Y10T137/7316; Y10T137/7319; Y10T137/8593; Y10T137/877; Y10T137/87708; Y10T137/87732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A DUPLEX FILTER PLANT COMPRISING A PAIR OF FILTER UNITS, A CONDUIT CONNECTED WITH EACH UNIT FOR DELIVERING LIQUID TO BE FILTERED, A SECOND CONDUIT CONNECTED WITH EACH UNIT FOR RECEIVING LIQUID FILTERED BY SAID UNIT, A ROTARY VALVE PLUG FOR CONTROLLING THE FLOW OF LIQUID THROUGH EACH SAID FILTER UNIT, A MANUALLY ROTATABLE CHANGEOVER DEVICE FOR ROTATING SAID VALVE PLUGS INTO ONE PRE-DETERMINED POSITION SUCH THAT ONE OF THE UNITS IS CONNECTED IN SERVICE TO FILTER LIQUID AND THE OTHER UNIT IS WITHDRAWN FROM SERVICE AND ISOLATED FROM SAID CONDUITS AND INTO A SECOND PRE-DETERMINED POSITION SUCH THAT THE SAID OTHER UNIT IS BROUGHT INTO SERVICE TO FILTER LIQUID AND THE FIRST MENTIONED UNIT IS WITHDRAWN FROM SERVICE AND ISOLATED FROM SAID CONDUITS, MANUALLY OPERABLE DRAIN VALVE MEANS CONNECTED WITH SAID UNITS FOR RECONNECTING SAID CONDUITS WITH THE UNIT WITHDRAWN FROM SERVICE SO AS TO INITIATE A REFLUX OF FILTERED LIQUID THROUGH THE FILTER UNIT WITHDRAWN FROM SERVICE AND MEANS OPERABLE POSITIVELY TO PREVENT THE OPERATION OF SAID DRAIN VALVE MEANS EXCEPT WHEN THE MANUALLY ROTATABLE CHANGEOVER DEVICE IS IN ONE OF ITS SAID PRE-DETERMINED POSITIONS.
Claim 2
Dependent Claim
187 words
A DUPLEX FILTER PLANT COMPRISING A PAIR OF FILTER UNITS, A CONDUIT CONNECTED WITH EACH UNIT FOR DELIVERING LIQUID TO BE FILTERED, A SECOND CONDUIT CONNECTED WITH EACH UNIT FOR RECEIVING LIQUID FILTERED BY SAID UNIT, A ROTARY VALVE PLUG FOR CONTROLLING THE FLOW OF LIQUID THROUGH EACH SAID FILTER UNIT, A MANUALLY ROTATABLE CHANGEOVER DEVICE FOR ROTATING SAID VALVE PLUGS INTO ONE PRE-DETERMINED POSITION SUCH THAT ONE OF THE UNITS IS CONNECTED IN SERVICE TO FILTER LIQUID AND THE OTHER UNIT IS WITHDRAWN FROM SERVICE AND ISOLATED FROM SAID CONDUITS AND INTO A SECOND PRE-DETERMINED POSITION SUCH THAT THE SAID OTHER UNIT IS BROUGHT INTO SERVICE TO FILTER LIQUID AND THE FIRST MENTIONED UNIT IS WITHDRAWN FROM SERVICE AND ISOLATED FROM SAID CONDUITS, MANUALLY OPERABLE DRAIN VALVE MEANS CONNECTED WITH SAID UNITS FOR RECONNECTING SAID CONDUITS WITH THE UNIT WITHDRAWN FROM SERVICE SO AS TO INITIATE A REFLUX OF FILTERED LIQUID THROUGH THE FILTER UNIT WITHDRAWN FROM SERVICE AND MEANS OPERABLE POSITIVELY TO PREVENT THE OPERATION OF SAID DRAIN VALVE MEANS EXCEPT WHEN THE MANUALLY ROTATABLE CHANGEOVER DEVICE IS IN ONE OF ITS SAID PRE-DETERMINED POSITIONS.
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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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |