Patent US2533992A successfully refreshed from Google Patents.
US2533992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonia recovery unit
Assignee: Lummus Technology LLC
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Filing: 1947-09-26
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Granted: 1950-12-12
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Expires: 1967-09-26
Abstract
No abstract record available.
Inventors
- 👤 Austin S Brunjes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:47
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF PURIFYING AHEAT SENSITIVE MATERIAL IN A RELATIVELY DILUTE AQUEOUS AMMONIA SOLUTION WHICH COMPRISES DISTILLING SAID SOLUTION UNDER SUB-ATMOSPHERIC CONDITIONS DEVELOPED BY A STEAM JET SUCH THAT A RELATIVELY CONCENTRATED AQUEOUS AMMONIA SOLUTION FREE OF TH HEAT SENSITIVE MATERIAL DNA CONTAINING ABOUT 80% AMMONIA IS REMOVED OVERHEAD AND A RELATIVELY CONCENTRATED HEAT SENSITIVE MATERIAL IN AMMONIA SOLUTION IS REMOVED AS BOTTOMS PRODUCT, DIRECTLY INJECTING VACUM PRODUCING STEAM INTO SAID CONCENTRATED AQUEOUS AMMONIA OVERHEAD IN EXCESS OF THAT REQUIRED TO PRODUCE THE DESIRED VACUM TO REDUCE THE AMMONIA CONCENTRATION TO ABOUT 25% WITH A DEW POINT ABOVE THAT OF COOLING WATER AND CONDENSING SAID REDUCED CONCENTRATION OVERHEAD BY INDIRECT HEAT EXCHANGE WITH COOLING WATER.
Claim 2
Independent Claim
115 words
A METHOD OF PURIFYING AHEAT SENSITIVE MATERIAL IN A RELATIVELY DILUTE AQUEOUS AMMONIA SOLUTION WHICH COMPRISES DISTILLING SAID SOLUTION UNDER SUB-ATMOSPHERIC CONDITIONS DEVELOPED BY A STEAM JET SUCH THAT A RELATIVELY CONCENTRATED AQUEOUS AMMONIA SOLUTION FREE OF TH HEAT SENSITIVE MATERIAL DNA CONTAINING ABOUT 80% AMMONIA IS REMOVED OVERHEAD AND A RELATIVELY CONCENTRATED HEAT SENSITIVE MATERIAL IN AMMONIA SOLUTION IS REMOVED AS BOTTOMS PRODUCT, DIRECTLY INJECTING VACUM PRODUCING STEAM INTO SAID CONCENTRATED AQUEOUS AMMONIA OVERHEAD IN EXCESS OF THAT REQUIRED TO PRODUCE THE DESIRED VACUM TO REDUCE THE AMMONIA CONCENTRATION TO ABOUT 25% WITH A DEW POINT ABOVE THAT OF COOLING WATER AND CONDENSING SAID REDUCED CONCENTRATION OVERHEAD BY INDIRECT HEAT EXCHANGE WITH COOLING WATER.
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |