US3305094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vaccum filter
Assignee: Barnes Drill Co
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Filing: 1964-07-08
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Granted: 1967-02-21
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Expires: 1984-07-08
Abstract
No abstract record available.
Inventors
- 👤 Kenneth H Casson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:37
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/16; B01D29/00; B01D29/09; B01D29/62; B01D29/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A VACUUM FILTER, THE COMBINATION OF, A TANK ADAPTED TO BE FILLED TO AN APPROXIMATE LEVEL WITH LIQUID TO BE FILTERED, A CLOSURE SUPPORTED IN SAID TANK AND HAVING A BOTTOM OPENING DISPOSED BELOW SAID LEVEL, A SCREEN COVERING SAID BOTTOM OPENING THEREIN AND HAVING PORES COMMUNICATING THEREWITH, MEANS PROVIDING A DOWNWARDLY FACING SEALING SURFACE EXTENDING AROUND THE ENTIRE PERIPHERY OF SAID SCREEN, MEANS FOR GUIDING AN ELONGATED FLEXIBLE FILTER WEB ACROSS THE UNDERSIDE OF SAID SCREEN TO COVER THE LATTER, A PUMP FOR WITHDRAWING LIQUID FROM THE INTERIOR OF SAID CLOSURE TO CREATE A VACUUM THEREIN AND INDUCE THE STRAINING OF LIQUID THROUGH SAID WEB AFTER THE LATTER IS DRAWN UPWARDLY AND TIGHTLY AGAINST SAID SEALING
Claim 2
Dependent Claim
118 words
IN A VACUUM FILTER, THE COMBINATION OF, A TANK ADAPTED TO BE FILLED TO AN APPROXIMATE LEVEL WITH LIQUID TO BE FILTERED, A CLOSURE SUPPORTED IN SAID TANK AND HAVING A BOTTOM OPENING DISPOSED BELOW SAID LEVEL, A SCREEN COVERING SAID BOTTOM OPENING THEREIN AND HAVING PORES COMMUNICATING THEREWITH, MEANS PROVIDING A DOWNWARDLY FACING SEALING SURFACE EXTENDING AROUND THE ENTIRE PERIPHERY OF SAID SCREEN, MEANS FOR GUIDING AN ELONGATED FLEXIBLE FILTER WEB ACROSS THE UNDERSIDE OF SAID SCREEN TO COVER THE LATTER, A PUMP FOR WITHDRAWING LIQUID FROM THE INTERIOR OF SAID CLOSURE TO CREATE A VACUUM THEREIN AND INDUCE THE STRAINING OF LIQUID THROUGH SAID WEB AFTER THE LATTER IS DRAWN UPWARDLY AND TIGHTLY AGAINST SAID SEALING
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |