US2657239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hexamethylene-diamines
Assignee: EIDP Inc
•
Filing: 1950-10-09
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Granted: 1953-10-27
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Expires: 1970-10-09
Abstract
No abstract record available.
Inventors
- 👤 George W Rigby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:57
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/24; C07C209/26; C07C211/00; C07C211/01; C07C211/26; C07C211/27; C07C211/43; C07C211/44; C07C211/49; C07C211/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
PROCESS OF PREPARING A HEXAMETHYLENEDIAMINE WHICH COMPRISES REACTING ADIPALDEHYDE IN A LIQUID REACTION MEDIUM WITH A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
20 words
PROCESS OF PREPARING A HEXAMETHYLENEDIAMINE WHICH COMPRISES REACTING ADIPALDEHYDE IN A LIQUID REACTION MEDIUM WITH A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2045574A
Cited
US1989325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |