US2715466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precoating of rotary vacuum drum filter
Assignee: Wyeth Holdings LLC
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Filing: 1951-11-27
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Granted: 1955-08-16
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Expires: 1971-11-27
Abstract
No abstract record available.
Inventors
- 👤 Jr John Esposito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:22
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/44; B01D33/46; B01D33/466; B01D33/06; B01D33/073; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A METHOD OF FILTERING WHICH COMPRISES ROTATING THE DRUM OF A CONTINUOUS ROTARY VACUUM CLARIFICATION FILTER THROUGH A BODY OF CLARIFICATION LIQUID TO WET THE LOWER PORTION OF THE DRUM, DEPOSITING DRY FILTER AID ON THE TOP OF THE WET DRUM AS IT ROTATES, WHILE MAINTAINING SUFFICIENT VACUUM ON THE INTERIOR OF THE DRUM TO HOLD THE FILTER AID IN POSITION, UNTIL A DESIRED THICKNESS OF FILTERAID HAS BEEN BUILT UP ON THE DRUM, REPLACING THE BODY OF CLARIFIED LIQUID WITH A BODY OF UNCLARIFIED LIQUID, ROTATING THE FILTER AID COVERED DRUM THROUGH SAID LIQUID, WHEREBY SOLIDS IN SAID UNCLARIFIED LIQUID ARE DEPOSITED ON SAID FILTER AID ON AID DRUM AND CLARIFIED LIQUID PASSES THERETHROUGH, SHAVING OFF A LAYER OF SAID FILTER AID FROM SAID DRUM THEREBY REMOVING FILTERED SOLIDS THEREFROM, CONTINUING SAID FILTRATION AND SAID SHAVING UNTIL SAID LAYER OF FILTER AID HAS BEEN SUBSTANTIALLY COMPLETELY SHAVED FROM SAID DRUM, DRAINING THE UNFILTERED PORTION OF UNCLARIFIED LIQUID FROM SAID FILTER, AND REPEATING THE CYCLE.
Claim 2
Independent Claim
165 words
A METHOD OF FILTERING WHICH COMPRISES ROTATING THE DRUM OF A CONTINUOUS ROTARY VACUUM CLARIFICATION FILTER THROUGH A BODY OF CLARIFICATION LIQUID TO WET THE LOWER PORTION OF THE DRUM, DEPOSITING DRY FILTER AID ON THE TOP OF THE WET DRUM AS IT ROTATES, WHILE MAINTAINING SUFFICIENT VACUUM ON THE INTERIOR OF THE DRUM TO HOLD THE FILTER AID IN POSITION, UNTIL A DESIRED THICKNESS OF FILTERAID HAS BEEN BUILT UP ON THE DRUM, REPLACING THE BODY OF CLARIFIED LIQUID WITH A BODY OF UNCLARIFIED LIQUID, ROTATING THE FILTER AID COVERED DRUM THROUGH SAID LIQUID, WHEREBY SOLIDS IN SAID UNCLARIFIED LIQUID ARE DEPOSITED ON SAID FILTER AID ON AID DRUM AND CLARIFIED LIQUID PASSES THERETHROUGH, SHAVING OFF A LAYER OF SAID FILTER AID FROM SAID DRUM THEREBY REMOVING FILTERED SOLIDS THEREFROM, CONTINUING SAID FILTRATION AND SAID SHAVING UNTIL SAID LAYER OF FILTER AID HAS BEEN SUBSTANTIALLY COMPLETELY SHAVED FROM SAID DRUM, DRAINING THE UNFILTERED PORTION OF UNCLARIFIED LIQUID FROM SAID FILTER, AND REPEATING THE CYCLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-15 | 1959-02-14 | 1959-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-15 | 1963-02-14 | 1963-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-15 | 1967-02-14 | 1967-08-16 | $7700.00 | Window Closed / Lapsed |