US2675302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of anhydrous hydrazine
Assignee: Mathieson Chemical Corp
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Filing: 1947-11-08
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Granted: 1954-04-13
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Expires: 1967-11-08
Abstract
No abstract record available.
Inventors
- 👤 John E Weiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:39
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
PROCESS ACCORDING TO WHICH A HYDRAZINE SULFATE IS ADMIXED WITH A LIQUID AMMONIA SOLUTION OF HYDRAZINE, THE HYDRAZINE CONCENTRATION OF THE SOLUTION BEING THEREBY INCREASED AND AN AMMONIUM SULFATE-AMMONIA COMPLEX FORMED; THE SOLUTION IS SEPARATED FROM THE COMPLEX FORMED; THE HYDRAZINE IS RECOVERED THEREFROM BY EVAPORATION OF AMMONIA; THE COMPLEX IS WASHED WITH LIQUID AMMONIA UNTIL FREE OF HYDRAZINE; THE COMPLEX IS DRIED AND DECOMPOSED BY HEATING TO FORM AMMONIUM SULFATE AND AMMONIA GAS AND WHICH IS FURTHER CHARACTERIZED IN THAT THE LIQUID AMMONIA SOLUTION OF HYDRAZINE INTO WHICH THE HYDRAZINE SULFATE IS INTRODUCED REPRESENTS THE WASH LIQUOR FROM THE COMPLEX-WASHING STEP.
Claim 2
Dependent Claim
102 words
PROCESS ACCORDING TO WHICH A HYDRAZINE SULFATE IS ADMIXED WITH A LIQUID AMMONIA SOLUTION OF HYDRAZINE, THE HYDRAZINE CONCENTRATION OF THE SOLUTION BEING THEREBY INCREASED AND AN AMMONIUM SULFATE-AMMONIA COMPLEX FORMED; THE SOLUTION IS SEPARATED FROM THE COMPLEX FORMED; THE HYDRAZINE IS RECOVERED THEREFROM BY EVAPORATION OF AMMONIA; THE COMPLEX IS WASHED WITH LIQUID AMMONIA UNTIL FREE OF HYDRAZINE; THE COMPLEX IS DRIED AND DECOMPOSED BY HEATING TO FORM AMMONIUM SULFATE AND AMMONIA GAS AND WHICH IS FURTHER CHARACTERIZED IN THAT THE LIQUID AMMONIA SOLUTION OF HYDRAZINE INTO WHICH THE HYDRAZINE SULFATE IS INTRODUCED REPRESENTS THE WASH LIQUOR FROM THE COMPLEX-WASHING STEP.
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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) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |