US3250800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of 2-phenylhydrazino-2, 2-dialkylnitrile
Assignee: WR Grace and Co
•
Filing: 1963-09-19
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Granted: 1966-05-10
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Expires: 1983-09-19
Abstract
No abstract record available.
Inventors
- 👤 John J Godfrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:59
CPC Classifications
C; C07; C07C; C07C251/00; C07C251/72; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
IN THE PROCESS FOR PREPARING A 2-PHENYLHYDRAZINO2,2-DIALKYLNITRILE FROM A CORRESPONDING DIALKYLKETONE PHENYLHYDRAZONE BY REACTING SAID DIALKYLKETONE PHENYLHYDRAZONE WITH HYDROGEN CYANIDE, THE IMPROVEMENT WHICH COMPRISES IMMEDIATELY SEPARATING SAID 2-PHENYLHYDRAZINO2,2-DIALKYLNITRILE FROM THE REACTION MIXTURE, DRYING SAID COMPOUND, AND MAINTAINING SAID COMPOUND IN A DRY, SOLID STATE.
Claim 2
Dependent Claim
44 words
IN THE PROCESS FOR PREPARING A 2-PHENYLHYDRAZINO2,2-DIALKYLNITRILE FROM A CORRESPONDING DIALKYLKETONE PHENYLHYDRAZONE BY REACTING SAID DIALKYLKETONE PHENYLHYDRAZONE WITH HYDROGEN CYANIDE, THE IMPROVEMENT WHICH COMPRISES IMMEDIATELY SEPARATING SAID 2-PHENYLHYDRAZINO2,2-DIALKYLNITRILE FROM THE REACTION MIXTURE, DRYING SAID COMPOUND, AND MAINTAINING SAID COMPOUND IN A DRY, SOLID STATE.
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |