US2568889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for concentrating hydrogen fluoride
Assignee: Universal Oil Products Co
•
Filing: 1947-02-27
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Granted: 1951-09-25
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Expires: 1967-02-27
Abstract
No abstract record available.
Inventors
- 👤 Olaf M Hanson
- 👤 Carl B Linn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:35
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR RECOVERING HYDROGEN FLUORIDE FROM A SOLUTION CONSISTING ESSENTIALLY OF HYDROGEN FLUORIDE AND WATER, WHICH COMPRISES DISTILLING SAID SOLUTION IN A DISTILLING ZONE WHILE INTRODUCING A STREAM OF SUBSTANTIALLY ANHYDROUS HYDROGEN CHLORIDE, MAINTAINING SAID ZOE AT CONDITIONS OF TEMPERATURE AND PRESSURE TO CAUSE THE DISCHARGE THEREFROM OF A RELATIVELY DRY VAPOROUS MIXTURE OF HYDROGEN FLUORIDE AND HYDROGEN CHLORIDE, COOLING SAID MIXTURE TO LIQUEFY THE HY-
Claim 2
Dependent Claim
67 words
A PROCESS FOR RECOVERING HYDROGEN FLUORIDE FROM A SOLUTION CONSISTING ESSENTIALLY OF HYDROGEN FLUORIDE AND WATER, WHICH COMPRISES DISTILLING SAID SOLUTION IN A DISTILLING ZONE WHILE INTRODUCING A STREAM OF SUBSTANTIALLY ANHYDROUS HYDROGEN CHLORIDE, MAINTAINING SAID ZOE AT CONDITIONS OF TEMPERATURE AND PRESSURE TO CAUSE THE DISCHARGE THEREFROM OF A RELATIVELY DRY VAPOROUS MIXTURE OF HYDROGEN FLUORIDE AND HYDROGEN CHLORIDE, COOLING SAID MIXTURE TO LIQUEFY THE HY-
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) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |