Patent US4629947A successfully refreshed from Google Patents.
Patent US3245536A successfully refreshed from Google Patents.
US3245536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum filtration
Assignee: Phillips Petroleum Co
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Filing: 1963-03-25
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Granted: 1966-04-12
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Expires: 1983-03-25
Abstract
No abstract record available.
Inventors
- 👤 Dwight L Mckay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:08
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/09
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
IN A VACUUM FILTERING PROCESS FOR SEPARATING SOLID MATERIAL FROM NON-SOLID MATERIAL WHEREIN, A SLURRY OF SAID SOLID AND NON-SOLID MATERIAL IS PASSED INTO CONTACT WITH A FILTER DRUM WHICH ROTATES AROUND A SHAFT WITHIN AN ESSENTIALLY FLUID-TIGHT CLOSED HOUSING, SAID SHAFT EXTENDS OUTSIDE SAID HOUSING, A PACKING ASSEMBLY IS DISPOSED AROUND THE EXTENDED PORTION OF SAID SHAFT, THE REGION WITHIN SAID DRUM IS MAINTAINED UNDER VACUUM, AND THE REGION WITHIN SAID HOUSING AND SURROUNDING SAID DRUM IS MAINTAINED UNDER SUPERATMOSPHERIC PRESSURE, THE IMPROVEMENT OF PREVENTING LEAKAGE OF EXTERNAL AIR THROUGH SAID PACKING ASSEMBLY AND ALONG SAID SHAFT INTO SAID FILTER DRUM, WHICH COMPRISES INTRODUCING GAS UNDER SUPERATMOSPHERIC PRESSURE FROM WITHIN SAID HOUSING INTO SAID PACKING ASSEMBLY AT AN INTERMEDIATE POINT THEREOF.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |