Patent US2908714A successfully refreshed from Google Patents.
US2908714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a diamine
Assignee: CIBA PHARM PROD Inc
•
Filing: 1956-09-20
•
Granted: 1959-10-13
•
Expires: 1976-09-20
Abstract
No abstract record available.
Inventors
- 👤 Shabica Anthony Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
C; C07; C07C; C07C269/00; C07C269/06; C07C209/00; C07C209/62; C07C209/68; C07C209/82; C07C209/84; C07C211/00; C07C211/01; C07C211/26; C07C211/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PROCESS FOR PREPARING N,N-DIMETHYL-ETHYLENEDIAMINE WHICH COMPRISES CONTACTING A MEMBER OF THE GROUP CONSISTING OF A B-HALOGENEOETHYLAMINE AND AN ACID ADDITION SALT THEREOF WITH AN AQUEOUD SOLUTION OF DIMETHYLAMINE IN THE PRESENCE OF AN ACID BINDING REAGENT AND AT REACTION TEMPERATURES RANGING FROM ABOUT 0*C. TO 50*C.
Claim 2
Dependent Claim
47 words
A PROCESS FOR PREPARING N,N-DIMETHYL-ETHYLENEDIAMINE WHICH COMPRISES CONTACTING A MEMBER OF THE GROUP CONSISTING OF A B-HALOGENEOETHYLAMINE AND AN ACID ADDITION SALT THEREOF WITH AN AQUEOUD SOLUTION OF DIMETHYLAMINE IN THE PRESENCE OF AN ACID BINDING REAGENT AND AT REACTION TEMPERATURES RANGING FROM ABOUT 0*C. TO 50*C.
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) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |