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Patent US3219550A successfully refreshed from Google Patents.
US3219550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydration of methylhydrazine
Assignee: FMC Corp
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Filing: 1961-06-21
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Granted: 1965-11-23
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Expires: 1981-06-21
Abstract
No abstract record available.
Inventors
- 👤 Horvitz David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:43
CPC Classifications
C; C07; C07C; C07C241/00; C07C241/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A METHOD FOR DEHYDRATING METHYLHYDRAZINE WHICH COMPRISES DISTILLATING AN AQUEOUS METHYLHYDRAZINE SOLUTION IN THE PRESENCE OF AN ALKALI METAL HYDROXIDE IN AN AMOUNT EQUAL TO ONE PART BY WEIGHT OF SAID HYDROXIDE FOR EACH 0.7 TO 2 PARTS BY WEIGHT OF WATER PRESENT IN SAID AQUEOUS METHYLHYDRAZINE SOLUTION AND RECOVERING THE DEHYDRATED METHYLHYDRAZINE AS VAPORS FROM THE DISTILLATION.
Claim 2
Independent Claim
58 words
A METHOD FOR DEHYDRATING METHYLHYDRAZINE WHICH COMPRISES DISTILLATING AN AQUEOUS METHYLHYDRAZINE SOLUTION IN THE PRESENCE OF AN ALKALI METAL HYDROXIDE IN AN AMOUNT EQUAL TO ONE PART BY WEIGHT OF SAID HYDROXIDE FOR EACH 0.7 TO 2 PARTS BY WEIGHT OF WATER PRESENT IN SAID AQUEOUS METHYLHYDRAZINE SOLUTION AND RECOVERING THE DEHYDRATED METHYLHYDRAZINE AS VAPORS FROM THE DISTILLATION.
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |