US2676911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of anhydrous hydrazine by extractive distillation with lower alkyl monoethers of diethylene glycol
Assignee: Mathieson Chemical Corp
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Filing: 1952-06-04
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Granted: 1954-04-27
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Expires: 1972-06-04
Abstract
No abstract record available.
Inventors
- 👤 Bernard H Nicolaisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:05
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 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 SOLVENT WHICH IS A LOWER ALKYL MONOETHER OF DIETHYLENE GLYCOL UNDER EXTRACTIVE DISTILLATION CONDITIONS OF ELEVATED TEMPERATURE, PRESSURE AND SOLVENT-TO-CHARGE RATIO ESTABLISHING SEPARATION OF A VAPOR FRACTION COMPRISING HYDRAZINE SUBSTANTIALLY FREE OF WATER AND A LIQUID FRACTION COMPRISING SAID SOLVENT AND WATER SUBSTANTIALLY FREE OF HYDRAZINE.
Claim 2
Dependent Claim
70 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 SOLVENT WHICH IS A LOWER ALKYL MONOETHER OF DIETHYLENE GLYCOL UNDER EXTRACTIVE DISTILLATION CONDITIONS OF ELEVATED TEMPERATURE, PRESSURE AND SOLVENT-TO-CHARGE RATIO ESTABLISHING SEPARATION OF A VAPOR FRACTION COMPRISING HYDRAZINE SUBSTANTIALLY FREE OF WATER AND A LIQUID FRACTION COMPRISING SAID SOLVENT AND WATER SUBSTANTIALLY FREE OF HYDRAZINE.
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) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |