Patent US3390512A successfully refreshed from Google Patents.
US3390512A
Expired / Lapsed
US
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Method and apparatus for filtering gas and cleaning of filter bags
Assignee: Phillips Petroleum Co
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Filing: 1962-05-21
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Granted: 1968-07-02
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Expires: 1982-05-21
Abstract
No abstract record available.
Inventors
- 👤 Lewis F Hanes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:39
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/66; B01D46/70; B01D46/71; B01D46/02; B01D46/04; B01D46/42; B01D46/4272
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
THE METHOD OF OPENING A STACK VALVE OF A CARBON BLACK PLANT BAG FILTER COMPARTMENT CONTAINING FILTER BAGS AT THE END OF THE FILTER CLEANING CYCLE WHICH COMPRISES OPENING THE STACK VALVE TO WIDE OPEN POSITION FOR A TIME SUFFICIENT TO REDUCE THE PRESSURE ON THE CLEAN SIDE OF THE BAGS SO AS TO INFLATE SUBSTANTIALLY THE FILTER BAGS; PARTIALLY CLOSING, WITHOUT FULLY CLOSING, THE STACK VALVE TO REDUCE THE VELOCITY OF THE GAS PASSING THROUGH THE FILTER BAGS UNTIL THE FILTER BAGS ARE FULLY INFLATED; AND THEN OPEINING THE STACK VALVE TO WIDE OPEN POSITION.
Claim 2
Dependent Claim
119 words
IN A BAG FILTER UNIT COMPRISING A PLURALITY OF FILTER BAGS SUSPENDED IN AN ENCLOSED COMPARTMENT HAVING A PRESSURIZED GAS INLET VALVE AND AN EXHAUST VALVE AND MEANS FOR INTRODUCING A SOLIDS LADEN GAS TO SAID FILTER BAGS AND WHEREIN A TIMING MECHANISM CLOSES THE EXHAUST VALVE AND OPENS THE PRESSURIZED GAS INLET VALVE FOR A CLEANING CYCLE TO CLEAN THE FILTER BAGS AFTER WHICH THE PRESSURIZED GAS INLET VALVE IS CLOSED AND THE EXHAUST VALVE IS OPENED TO RESUME THE FILTERING OPERATION, THE COMBINATION THEREWITH OF MEANS OPERATIVELY CONNECTED TO SAID EXHAUST VALVE AND SAID TIMING MECHANISM TO OPEN SAID EXHAUST VALVE FULL OPEN AT TERMINATION OF THE CLEANING CYCLE FOR A TIME SUFFICIENT TO EQUALIZE SUBSTANTIALLY THE
References Cited (Backward Citations)
US2746561A
Cited
GB788166A
Cited
US2943637A
Cited
US2836256A
Cited
US2871978A
Cited
US2980207A
Cited
US3073097A
Cited
US3057137A
Cited
US3116119A
Cited
US3217468A
Cited
US3243940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |