Patent US2762837A successfully refreshed from Google Patents.
US2762837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-(1, 1, 2, 2-tetracyanoethyl) ketones and their preparation
Assignee: EIDP Inc
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Filing: 1954-03-16
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Granted: 1956-09-11
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Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 Middleton William Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:16
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
ALPHA-(1,1,2,2,-TETRACYANOETHYL) KETONES OF THE FORMULA
Claim 2
Dependent Claim
5 words
ALPHA-(1,1,2,2,-TETRACYANOETHYL) KETONES OF THE FORMULA
Claim 3
Dependent Claim
24 words
PROCESS OF PREPARING AN ALPHA-(1,1,2,2-TETRACYANOETHYL) KETONE WHICH COMPRISES REACTING TETRACYANOETHYLENE WITH A KETONE CONTAINING A HYDROGEN-BEARING ALIPHATIC CARBON ATOM ALPHA TO THE KETONE GROUP.
Claim 4
Dependent Claim
24 words
PROCESS OF PREPARING AN ALPHA-(1,1,2,2-TETRACYANOETHYL) KETONE WHICH COMPRISES REACTING TETRACYANOETHYLENE WITH A KETONE CONTAINING A HYDROGEN-BEARING ALIPHATIC CARBON ATOM ALPHA TO THE KETONE GROUP.
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) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |