US3313680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for recovering relief gases from a sulphite pulp digester
Assignee: F J HOAR ASSOCIATES
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Filing: 1963-12-04
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Granted: 1967-04-11
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Expires: 1983-12-04
Abstract
No abstract record available.
Inventors
- 👤 Francis J Hoar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:38
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
209 words
IN A SYSTEM FOR RECOVERING RELIEF GASES FROM A SULPHITE PULP DIGESTER, (A) A DIGESTER, (B) A RECOVERY TOWER, (C) A HIGH PRESSURE STORAGE TANK, (D) A RAW ACID STORATE TANK, (E) MEANS FOR CONDUCTING HIGH PRESSURE RELIEF GAS FROM SAID DIGESTER TO SAID HIGH PRESSURE STORAGE TANK, (F) MEANS FOR CONDUCTING RELIEF GASES FROM SAID HIGH PRESSURE STORAGE TANK INTO SAID RECOVERY TOWER ADJACENT THE BOTTOM THEREOF, (G) A HEAT EXCHANGER, (H) MEANS FOR CONDUCTING LOW PRESSURE RELIEF GAS FROM SAID DIGESTER THROUGH SAID HEAT EXCHANGER INTO SAID RECOVERY TOWER ADJACENT THE BOTTOM THEREOF, (I) MEANS FOR CONDUCTING ACID FROM THE BOTTOM OF SAID RECOVERY TOWER THROUGH SAID HEAT EXCHANGER INTO SAID HIGH PRESSURE STORAGE TANK AND INTO SAID RAW ACID STORAGE TANK, (J) MEANS FOR CONDUCTING RELIEF GAS FROM THE TOP OF SAID RECOVERY TOWER TO AN ACID MANUFACTURING PLANT, (K) MEANS FOR ADJUSTABLY CONTROLLING THE PRESSURE OF THE RELIEF GAS FLOWING FROM SAID RECOVERY TOWER TO SAID ACID MANUFACTURING PLANT, (L) MEANS FOR CONDUCTING ACID FROM SAID ACID MANUFACTURING PLANT INTO SAID RAW ACID STORAGE TANK, AND (M) MEANS FOR CONDUCTING ACID FROM SAID RAW ACID STORAGE TANK INTO SAID RECOVERY TOWER ADJACENT THE TOP THEREOF TO FLOW COUNTER TO THE GAS ENTERING SAID RECOVERY TOWER.
Claim 2
Dependent Claim
209 words
IN A SYSTEM FOR RECOVERING RELIEF GASES FROM A SULPHITE PULP DIGESTER, (A) A DIGESTER, (B) A RECOVERY TOWER, (C) A HIGH PRESSURE STORAGE TANK, (D) A RAW ACID STORATE TANK, (E) MEANS FOR CONDUCTING HIGH PRESSURE RELIEF GAS FROM SAID DIGESTER TO SAID HIGH PRESSURE STORAGE TANK, (F) MEANS FOR CONDUCTING RELIEF GASES FROM SAID HIGH PRESSURE STORAGE TANK INTO SAID RECOVERY TOWER ADJACENT THE BOTTOM THEREOF, (G) A HEAT EXCHANGER, (H) MEANS FOR CONDUCTING LOW PRESSURE RELIEF GAS FROM SAID DIGESTER THROUGH SAID HEAT EXCHANGER INTO SAID RECOVERY TOWER ADJACENT THE BOTTOM THEREOF, (I) MEANS FOR CONDUCTING ACID FROM THE BOTTOM OF SAID RECOVERY TOWER THROUGH SAID HEAT EXCHANGER INTO SAID HIGH PRESSURE STORAGE TANK AND INTO SAID RAW ACID STORAGE TANK, (J) MEANS FOR CONDUCTING RELIEF GAS FROM THE TOP OF SAID RECOVERY TOWER TO AN ACID MANUFACTURING PLANT, (K) MEANS FOR ADJUSTABLY CONTROLLING THE PRESSURE OF THE RELIEF GAS FLOWING FROM SAID RECOVERY TOWER TO SAID ACID MANUFACTURING PLANT, (L) MEANS FOR CONDUCTING ACID FROM SAID ACID MANUFACTURING PLANT INTO SAID RAW ACID STORAGE TANK, AND (M) MEANS FOR CONDUCTING ACID FROM SAID RAW ACID STORAGE TANK INTO SAID RECOVERY TOWER ADJACENT THE TOP THEREOF TO FLOW COUNTER TO THE GAS ENTERING SAID RECOVERY TOWER.
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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |