US2634824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovery of hydrogen cyanide
Assignee: Dow Chemical Co
•
Filing: 1951-01-22
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Granted: 1953-04-14
•
Expires: 1971-01-22
Abstract
No abstract record available.
Inventors
- 👤 Lewis R Drake
- 👤 Stephen C Stowe
- 👤 Kenneth F Broucek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:38
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A METHOD FOR THE REMOVAL OF HYDROGEN CYANIDE FROM GASEOUS MIXTURES CONTAINING THE SAME, WHICH COMPRISES THE STEP OF CONTACT EXTRACTION OF THE MIXTURE WITH A SOLVENT SELECTED FROM THE CLASS CONSISTING OF PHOSPHITE COMPOUNDS WHICH ARE LIQUID AT ROOM TEMPERATURE AND HAVE THE GENERAL FORMULA:
Claim 2
Independent Claim
46 words
A METHOD FOR THE REMOVAL OF HYDROGEN CYANIDE FROM GASEOUS MIXTURES CONTAINING THE SAME, WHICH COMPRISES THE STEP OF CONTACT EXTRACTION OF THE MIXTURE WITH A SOLVENT SELECTED FROM THE CLASS CONSISTING OF PHOSPHITE COMPOUNDS WHICH ARE LIQUID AT ROOM TEMPERATURE AND HAVE THE GENERAL FORMULA:
References Cited (Backward Citations)
US2064838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |