Patent US2731490A successfully refreshed from Google Patents.
US2731490A
Expired / Lapsed
US
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Method of making cyanohydrins
Assignee: Individual
•
Filing: 1953-01-28
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Granted: 1956-01-17
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Expires: 1973-01-28
Abstract
No abstract record available.
Inventors
- 👤 Barsky George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:25
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A CONTINUOUS METHOD OF MAKING CYANOHYDRINS WHICH COMPRISES PASSING A GAS CONTAINING HCN UPWARDLY THROUGH SUCCESSIVE ZONES OF REACTION, INTRODUCING AQUEOUS ALKALI SOLUTION INTO THE UPPERMOST ZONE AND CAUSING THE SAME TO FLOW DOWNWARDS, INTRODUCING INTO THE INTERMEDIATE ZONE A LIQUID CARBONYL SUBSTANCE TAKEN FROM THE CLASS CONSISTING OF ALDEHYDES AND KETONES, AND INTRODUCING INTO THE
Claim 2
Dependent Claim
56 words
A CONTINUOUS METHOD OF MAKING CYANOHYDRINS WHICH COMPRISES PASSING A GAS CONTAINING HCN UPWARDLY THROUGH SUCCESSIVE ZONES OF REACTION, INTRODUCING AQUEOUS ALKALI SOLUTION INTO THE UPPERMOST ZONE AND CAUSING THE SAME TO FLOW DOWNWARDS, INTRODUCING INTO THE INTERMEDIATE ZONE A LIQUID CARBONYL SUBSTANCE TAKEN FROM THE CLASS CONSISTING OF ALDEHYDES AND KETONES, AND INTRODUCING INTO THE
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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |