US2652430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of n-substituted saturated diamines
Assignee: Shell Development Co
•
Filing: 1950-02-13
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Granted: 1953-09-15
•
Expires: 1970-02-13
Abstract
No abstract record available.
Inventors
- 👤 Harry De V Finch
- 👤 Scaver A Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:09
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A PROCESS FOR PREPARING AN N-SUBSTITUTED 1,3-ALKANEDIAMINE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
11 words
A PROCESS FOR PREPARING AN N-SUBSTITUTED 1,3-ALKANEDIAMINE OF THE GENERAL FORMULA
References Cited (Backward Citations)
US2367366A
Cited
US2540938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |