Patent US2537857A successfully refreshed from Google Patents.
US2537857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling of amines by means of di-tertiary-alkyl peroxides
Assignee: Shell Development Co
•
Filing: 1948-07-17
•
Granted: 1951-01-09
•
Expires: 1968-07-17
Abstract
No abstract record available.
Inventors
- 👤 John H Raley
- 👤 Jr Frank H Seubold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:27
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
A PROCESS FOR THE PRODUCTION OF A C-SUBSTITUTED OCTA-ALKYLPIPERAZINE BY HEATING A SOLUTION OF A NORMALLY LIQUID LOWER PRIMARY ALKYLAMINE CONTAINING BUT A SINGLE HYDROGEN ATOM ATTACHED TO THE CARBON ATOM THAT IS DIRECTLY BONDED TO THE NITROGEN ATOM AND A DI-TERTIARY-ALKYL PREOXIDE TO THE DECOMPOSITION TEMPERATURE OF THE DI-TERTIARY-ALKYL PEROXIDE AND DISTILLING AMMONIA FROM THE PRODUCTS OF THE REACTION BETWEEN THE AMINE AND THE DI-TERTIARY-ALKYL PEROXIDE.
References Cited (Backward Citations)
US2400022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |