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Patent US3138545A successfully refreshed from Google Patents.
US3138545A
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Dehydration of nu, nu-dimethylhydrazine by distillation in the presence of an alkali
Assignee: FMC Corp
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Filing: 1955-05-10
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Granted: 1964-06-23
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Expires: 1975-05-10
Abstract
No abstract record available.
Inventors
- 👤 Sherman K Reed
- 👤 Paul E Levesque
- 👤 John A Pianfetti
- 👤 Harold M Vessey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:20
CPC Classifications
C; C07; C07C; C07C241/00; C07C241/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR DEHYDRATING AN AQUEOUS PREPARATION OF N,N-DIMETHYLHYDRAZINE WHICH COMPRISES DISTILLING THE N,N-DIMETHYLHYDRAZINE IN THE PRESENCE OF AN ALKALI SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE, THE ALKALI BEING PRESENT IN QUANTITY SUFFICIENT TO PRODUCE A SOLUTION CONTAINING ABOUT 10% TO 50% BY WEIGHT OF SAID ALKALI ON THE COMBINED ALKALI-WATER BASIS, AND REMOVING A DISTILLLATE OF N,N-DIMETHYLHYDRAZINE CONTAINING LESS THAT 0.5% WATER BY VOLUME.
Claim 2
Dependent Claim
70 words
A PROCESS FOR DEHYDRATING AN AQUEOUS PREPARATION OF N,N-DIMETHYLHYDRAZINE WHICH COMPRISES DISTILLING THE N,N-DIMETHYLHYDRAZINE IN THE PRESENCE OF AN ALKALI SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE, THE ALKALI BEING PRESENT IN QUANTITY SUFFICIENT TO PRODUCE A SOLUTION CONTAINING ABOUT 10% TO 50% BY WEIGHT OF SAID ALKALI ON THE COMBINED ALKALI-WATER BASIS, AND REMOVING A DISTILLLATE OF N,N-DIMETHYLHYDRAZINE CONTAINING LESS THAT 0.5% WATER BY VOLUME.
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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |