Patent US3191314A successfully refreshed from Google Patents.
US3191314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas circulation in a pre-coat filter
Assignee: Phillips Petroleum Co
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Filing: 1962-04-23
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Granted: 1965-06-29
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Expires: 1982-04-23
Abstract
No abstract record available.
Inventors
- 👤 Houston R Flournoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:32
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44; B; B01; B01D; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN THE PROCESS OF FILTERING PETROLEUM SULFONATE SLIMES PRODUCED BY SULFONATING A VISCOUS, HIGHLY REFINED BRIGHT STOCK AND NEUTRALIZING THE RESULTING SULFONIC ACID WITH A BASIC ALKALINE EARTH METAL COMPOUND WHEREIN THE SULFONATE SLIME IS FILTERED ON A PRECOATED, ROTARY VACUUM FILTER CONTAINED IN A VAPOR-TIGHT CASE AND THE FILTER CAKE IS PASSED BY MEANS OF AN ENCLOSED CHUTE AND AN ENCLOSED CONVEYOR TO A DRYING ZONE, A SUBSTANTIALLY CONSTANT POSITIVE PRESSURE BEING MAINTAINED IN THE VAPOR-TIGHT CASE BY A NONCONDENSIBLE GAS INTRODUCED INTO SAID CASE, THE IMPROVEMENT COMPRISING PASSING A STREAM OF NONCONDENSIBLE HYDROCARBON GAS INTO SAID ENCLOSED CHUTE; DIVIDING SAID STREAM SO THAT A FIRST PORTION OF SAID GAS INTRO-
Claim 2
Dependent Claim
112 words
IN THE PROCESS OF FILTERING PETROLEUM SULFONATE SLIMES PRODUCED BY SULFONATING A VISCOUS, HIGHLY REFINED BRIGHT STOCK AND NEUTRALIZING THE RESULTING SULFONIC ACID WITH A BASIC ALKALINE EARTH METAL COMPOUND WHEREIN THE SULFONATE SLIME IS FILTERED ON A PRECOATED, ROTARY VACUUM FILTER CONTAINED IN A VAPOR-TIGHT CASE AND THE FILTER CAKE IS PASSED BY MEANS OF AN ENCLOSED CHUTE AND AN ENCLOSED CONVEYOR TO A DRYING ZONE, A SUBSTANTIALLY CONSTANT POSITIVE PRESSURE BEING MAINTAINED IN THE VAPOR-TIGHT CASE BY A NONCONDENSIBLE GAS INTRODUCED INTO SAID CASE, THE IMPROVEMENT COMPRISING PASSING A STREAM OF NONCONDENSIBLE HYDROCARBON GAS INTO SAID ENCLOSED CHUTE; DIVIDING SAID STREAM SO THAT A FIRST PORTION OF SAID GAS INTRO-
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) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |