Patent US2700668A successfully refreshed from Google Patents.
US2700668A
Expired / Lapsed
US
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Preparation of ketopiperazines
Assignee: Rohm and Haas Co
•
Filing: 1952-02-08
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Granted: 1955-01-25
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Expires: 1972-02-08
Abstract
No abstract record available.
Inventors
- 👤 James S Strong
- 👤 W E Craig
- 👤 Vincent T Elkind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:15
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/06; C07D241/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS WHICH COMPRISES REACTING IN MOLAR PROPORTIONS A COMPOUND OF THE FORMULA R''R"CO. HYDROGEN CYANIDE, AND ETHYLENEDIMINE, HEATING THE REACTION MIXTURE TO A TEMPERATURE OF AT LEAST 90*C. IN THE PRESENCE OF WATER, AND SEPARATING A KETOPIPERAZINE OF THE FORMULA
Claim 2
Dependent Claim
41 words
A PROCESS WHICH COMPRISES REACTING IN MOLAR PROPORTIONS A COMPOUND OF THE FORMULA R''R"CO. HYDROGEN CYANIDE, AND ETHYLENEDIMINE, HEATING THE REACTION MIXTURE TO A TEMPERATURE OF AT LEAST 90*C. IN THE PRESENCE OF WATER, AND SEPARATING A KETOPIPERAZINE OF THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-24 | 1958-07-26 | 1959-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-24 | 1962-07-26 | 1963-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-24 | 1966-07-26 | 1967-01-25 | $7700.00 | Window Closed / Lapsed |