Patent US3306459A successfully refreshed from Google Patents.
US3306459A
Expired / Lapsed
US
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Assignee: EMD Millipore Corp
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Filing: 1964-12-15
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Granted: 1967-02-28
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Expires: 1984-12-15
Abstract
No abstract record available.
Inventors
- 👤 John H Bush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:45
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/08; B01D63/082; B01D63/084; B01D25/00; B01D25/22; B01D25/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PLATE-LIKE FILTER UNIT COMPRISING A DISC HAVING RIM AND HUB MEMBERS, THE RIM MEMBER HAVING UPPER AND LOWER ANNULAR PERIPHERAL FLANGES AND THE HUB HAVING UPPER AND LOWER ANNULAR FLANGES AND ALSO HAVING A CENTRAL OPENING THERETHROUGH, SAID RIM HAVING LATERAL PASSAGEWAYS THERETHROUGH TERMINATING BELOW THE DISC FOR THE ENTRANCE OF FLUID, AND THE HUB HAVING FLUID DISCHARGE PASSAGEWAYS THERETHROUGH HAVING THEIR ENTRANCES ABOVE THE DISC AND EXTENDING TO THE CENTRAL OPENING, A SCREEN FOR SUPPORTING A FILTER ELEMENT MOUNTED ON AND UNITED TO THE RESPECTIVE UPPER ANNULAR FLANGES, AND A PLURALITY OF CONCENTRIC WIRE COILS FOR SUPPORTING THE SCREEN RESTING ON THE SURFACE OF THE DISC AND HAVING THEIR UPPER PORTIONS ENGAGING THE SCREEN, NO TWO OF SAID COILS WHICH ARE ADJACENT ONE ANOTHER HAVING THE SAME PITCH WHICH PREVENTS INTERMESHING OF THE COILS.
Claim 2
Dependent Claim
136 words
A PLATE-LIKE FILTER UNIT COMPRISING A DISC HAVING RIM AND HUB MEMBERS, THE RIM MEMBER HAVING UPPER AND LOWER ANNULAR PERIPHERAL FLANGES AND THE HUB HAVING UPPER AND LOWER ANNULAR FLANGES AND ALSO HAVING A CENTRAL OPENING THERETHROUGH, SAID RIM HAVING LATERAL PASSAGEWAYS THERETHROUGH TERMINATING BELOW THE DISC FOR THE ENTRANCE OF FLUID, AND THE HUB HAVING FLUID DISCHARGE PASSAGEWAYS THERETHROUGH HAVING THEIR ENTRANCES ABOVE THE DISC AND EXTENDING TO THE CENTRAL OPENING, A SCREEN FOR SUPPORTING A FILTER ELEMENT MOUNTED ON AND UNITED TO THE RESPECTIVE UPPER ANNULAR FLANGES, AND A PLURALITY OF CONCENTRIC WIRE COILS FOR SUPPORTING THE SCREEN RESTING ON THE SURFACE OF THE DISC AND HAVING THEIR UPPER PORTIONS ENGAGING THE SCREEN, NO TWO OF SAID COILS WHICH ARE ADJACENT ONE ANOTHER HAVING THE SAME PITCH WHICH PREVENTS INTERMESHING OF THE COILS.
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) | 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 |