US3306457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drum filter
Assignee: Improved Machinery Inc
•
Filing: 1963-09-16
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Granted: 1967-02-28
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Expires: 1983-09-16
Abstract
No abstract record available.
Inventors
- 👤 Neil F Putnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:22
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/067; B01D33/073; B01D33/09; B01D33/44; B01D33/46; B01D33/465; B01D33/80; B01D33/82; B01D2201/00; B01D2201/28; B01D2201/282
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A ROTARY DRUM FILTER HAVING A CYLINDRICAL DRUM WITH A PLURALITY OF AXIALLY EXTENDING AND RADIALLY UPSTANDING RIB MEMBERS SPACED FROM ONE ANOTHER TO DEFINE A PLURALITY OF AXIALLY EXTENDING FILTRATE COMPARTMENTS ON THE SURFACE OF SAID DRUM THROUGHOUT ITS CIRCUMFERENCE, A FILTER SURFACE COMPRISING A PLURALITY OF GENERALLY RECTANGULAR FILTER ELEMENTS SUPPORTED ON THE OUTER EDGES OF SAID RIB MEMBERS AND HAVING THEIR ADJACENT EDGES ABUTTING ONE ANOTHER TO COVER SAID FILTRATE COMPARTMENTS THROUGHOUT THE SURFACE OF SAID DRUM, EACH SAID FILTER ELEMENT BEING OF GENERALLY RECTANGULAR SHAPE DEFINING AN OUTER CONVEX SURFACE CURVED IN THE FORM OF A PORTION OF A CYLINDER, SAID ELEMENT HAVING ON ITS CONVEX SURFACE UPSTANDING RIM MEANS
Claim 2
Dependent Claim
115 words
IN A ROTARY DRUM FILTER HAVING A CYLINDRICAL DRUM WITH A PLURALITY OF AXIALLY EXTENDING AND RADIALLY UPSTANDING RIB MEMBERS SPACED FROM ONE ANOTHER TO DEFINE A PLURALITY OF AXIALLY EXTENDING FILTRATE COMPARTMENTS ON THE SURFACE OF SAID DRUM THROUGHOUT ITS CIRCUMFERENCE, A FILTER SURFACE COMPRISING A PLURALITY OF GENERALLY RECTANGULAR FILTER ELEMENTS SUPPORTED ON THE OUTER EDGES OF SAID RIB MEMBERS AND HAVING THEIR ADJACENT EDGES ABUTTING ONE ANOTHER TO COVER SAID FILTRATE COMPARTMENTS THROUGHOUT THE SURFACE OF SAID DRUM, EACH SAID FILTER ELEMENT BEING OF GENERALLY RECTANGULAR SHAPE DEFINING AN OUTER CONVEX SURFACE CURVED IN THE FORM OF A PORTION OF A CYLINDER, SAID ELEMENT HAVING ON ITS CONVEX SURFACE UPSTANDING RIM MEANS
References Cited (Backward Citations)
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Cited
US2289411A
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US2263852A
Cited
US2724507A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |