US3294650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for concentrating sulfuric acid in a quartz rectifying column
Assignee: Heraeus Schott Quarzschmelze GmbH
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Filing: 1963-07-31
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Granted: 1966-12-27
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Expires: 1983-07-31
Abstract
No abstract record available.
Inventors
- 👤 Manteufel Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:11
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/88; B; B01; B01D; B01D3/00; B01D3/14; C01B17/90; Y; Y10; Y10S; Y10S159/00; Y10S159/15; Y10S159/19; Y10S203/00; Y10S203/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR THE CONTINUOUS DISTILLATION OF A CRUDE SULFURIC ACID IN A QUARTZ RECTIFYING COLUMN TO PRODUCE ANALYSTICALLY PURE SULFURIC ACID, INCLUDING STEPS OF RECTIFYING THE CRUDE SULFURIC ACID IN SAID RECTIFYING COLUMN RO PRODUCE A HIGH AND A LOW-BOILING POINT FRACTION IN SAID COLUMN, WITHDRAWING HIGH BOILING POINT FRICTION AS A LIQUID, EVAPORATING WITHDRAWN LIQUID AND CONDENSING A PORTION OF THE RESULTING VAPOR WHILE LEAVING A PORTION OF SAID VAPOR UNCONDENSED, UTILIZING ALL THE HEAT OF SAID CONDENSATION TO PARTIALLY EVAPORATE SAID CRUDE SULFURIC ACID AND FORM A GASLIQUID MIXTURE THEREOF, INTRODUCING SAID PARTIALLY EVAPO-
Claim 2
Dependent Claim
97 words
A PROCESS FOR THE CONTINUOUS DISTILLATION OF A CRUDE SULFURIC ACID IN A QUARTZ RECTIFYING COLUMN TO PRODUCE ANALYSTICALLY PURE SULFURIC ACID, INCLUDING STEPS OF RECTIFYING THE CRUDE SULFURIC ACID IN SAID RECTIFYING COLUMN RO PRODUCE A HIGH AND A LOW-BOILING POINT FRACTION IN SAID COLUMN, WITHDRAWING HIGH BOILING POINT FRICTION AS A LIQUID, EVAPORATING WITHDRAWN LIQUID AND CONDENSING A PORTION OF THE RESULTING VAPOR WHILE LEAVING A PORTION OF SAID VAPOR UNCONDENSED, UTILIZING ALL THE HEAT OF SAID CONDENSATION TO PARTIALLY EVAPORATE SAID CRUDE SULFURIC ACID AND FORM A GASLIQUID MIXTURE THEREOF, INTRODUCING SAID PARTIALLY EVAPO-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |