Patent US2678298A successfully refreshed from Google Patents.
US2678298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation of hydrazine with a glycol
Assignee: Mathieson Chemical Corp
•
Filing: 1952-11-15
•
Granted: 1954-05-11
•
Expires: 1972-11-15
Abstract
No abstract record available.
Inventors
- 👤 Bernard H Nicolaisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:04
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY ANHYDROUS HYDRAZINE FROM AQUEOUS HYDRAZINE WHICH COMPRISES SUBJECTING THE AQUEOUS HYDRAZINE CHARGE TO EXTRACTIVE DISTILLATION WITH A GLYCOL SOLVENT UNDER EXTRACTIVE DISTILLATION CONDITIONS OF ELEVATED TEMPERATURE, PRESSURE AND SOLVENTTO-CHARGE RATIO ESTABLISHING SEPARATION OF A VAPOR FRACTION COMPRISING SUBSTANTIALLY PURE WATER AND A LIQUID FRACTION COMPRISING GLYCOL AND HYDRAZINE SUBSTANTIALLY FREE FROM WATER, REMOVING AND DISTILLING THE LIQUID FRACTION TO RECOVER A VAPOR FRACTION COMPRISING SUBSTANTIALLY ANHYDROUS HYDRAZINE AND A LIQUID FRACTION COMPRISING GLYCOL SOLVENT.
Claim 2
Dependent Claim
81 words
A PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY ANHYDROUS HYDRAZINE FROM AQUEOUS HYDRAZINE WHICH COMPRISES SUBJECTING THE AQUEOUS HYDRAZINE CHARGE TO EXTRACTIVE DISTILLATION WITH A GLYCOL SOLVENT UNDER EXTRACTIVE DISTILLATION CONDITIONS OF ELEVATED TEMPERATURE, PRESSURE AND SOLVENTTO-CHARGE RATIO ESTABLISHING SEPARATION OF A VAPOR FRACTION COMPRISING SUBSTANTIALLY PURE WATER AND A LIQUID FRACTION COMPRISING GLYCOL AND HYDRAZINE SUBSTANTIALLY FREE FROM WATER, REMOVING AND DISTILLING THE LIQUID FRACTION TO RECOVER A VAPOR FRACTION COMPRISING SUBSTANTIALLY ANHYDROUS HYDRAZINE AND A LIQUID FRACTION COMPRISING GLYCOL SOLVENT.
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) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |