Patent US2774725A successfully refreshed from Google Patents.
US2774725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of concentrating aqueous hydrazine
Assignee: Olin Corp
•
Filing: 1953-04-02
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Granted: 1956-12-18
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Expires: 1973-04-02
Abstract
No abstract record available.
Inventors
- 👤 Oscar J Swenson
- 👤 Don W Ryker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:26
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN THE PROCESS OF CONCENTRATING AQUEOUS HYDRAZINE, THE STEP WHICH COMPRISES DISTILLING SIA DHYDRAZINE IN CONTACT WITH A DEHYDRATING AGENT AND A SATURATED HYDROCARBON WHOSE BOILING TEMPERATURE AT ATMOSPHERIC PRESSURE IS WITHIN THE RANGE OF ABOUT 90* C. TO 175* C., SAID HYDROCARBON BEING PRESENT IN AN AMOUNT SUFFICIENT TO MAINTAIN THE VAPOR OF SAID HYDROCARBON IN INTIMATE CONTACT WITH THE EVOLVED HYDRAZINE VAPOR THROUGHOUT THE DISTILLATION.
Claim 2
Dependent Claim
67 words
IN THE PROCESS OF CONCENTRATING AQUEOUS HYDRAZINE, THE STEP WHICH COMPRISES DISTILLING SIA DHYDRAZINE IN CONTACT WITH A DEHYDRATING AGENT AND A SATURATED HYDROCARBON WHOSE BOILING TEMPERATURE AT ATMOSPHERIC PRESSURE IS WITHIN THE RANGE OF ABOUT 90* C. TO 175* C., SAID HYDROCARBON BEING PRESENT IN AN AMOUNT SUFFICIENT TO MAINTAIN THE VAPOR OF SAID HYDROCARBON IN INTIMATE CONTACT WITH THE EVOLVED HYDRAZINE VAPOR THROUGHOUT THE DISTILLATION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |