Patent US3175691A successfully refreshed from Google Patents.
US3175691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detachably securing drainage members on filters
Assignee: Dorr Oliver Inc
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Filing: 1962-03-29
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Granted: 1965-03-30
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Lloyd W Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:24
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/067; B01D33/073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A FILTER, THE COMBINATION WHICH COMPRISES A ROTARY FILTER DRUM, A PLURALITY OF DIVIDER STRIPS FIXED TO THE OUTER DRUM SURFACE PARALLEL TO THE DRUM AXIS AND SPACED FROM ONE ANOTHER, EACH STRIP HAVING A LONGITUDINALLY EXTENDING LATERAL OVERHANG AT EACH SIDE THEROF; A SUBSTANTIALLY RIGID DRAINAGE SUPPORT MEMBER FOR THE FILTER MEDIUM LOCATED ON THE DRUM SURFACE BETWEEN A PAIR OF DIVIDER STRIPS AND SHAPED TO CONFORM TO THE CURVATURE OF THE DRUM, SAID MEMBER BEING OF SUBSTANTIAL THICKNESS, AND FORMED WITH A PLURALITY OF TRANSVERSE OPEN-ENDED EXTERNAL GROOVES; A PLURALITY OF ELONGATE SPRINGY LOCKING MEMBERS TO ENGAGE
Claim 2
Dependent Claim
100 words
IN A FILTER, THE COMBINATION WHICH COMPRISES A ROTARY FILTER DRUM, A PLURALITY OF DIVIDER STRIPS FIXED TO THE OUTER DRUM SURFACE PARALLEL TO THE DRUM AXIS AND SPACED FROM ONE ANOTHER, EACH STRIP HAVING A LONGITUDINALLY EXTENDING LATERAL OVERHANG AT EACH SIDE THEROF; A SUBSTANTIALLY RIGID DRAINAGE SUPPORT MEMBER FOR THE FILTER MEDIUM LOCATED ON THE DRUM SURFACE BETWEEN A PAIR OF DIVIDER STRIPS AND SHAPED TO CONFORM TO THE CURVATURE OF THE DRUM, SAID MEMBER BEING OF SUBSTANTIAL THICKNESS, AND FORMED WITH A PLURALITY OF TRANSVERSE OPEN-ENDED EXTERNAL GROOVES; A PLURALITY OF ELONGATE SPRINGY LOCKING MEMBERS TO ENGAGE
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |