US2587043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 1,2 di-primary amines
Assignee: AT&T Inc
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Filing: 1949-01-06
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Granted: 1952-02-26
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Expires: 1969-01-06
Abstract
No abstract record available.
Inventors
- 👤 Hawkins Walter Lincoln
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:06
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
THE METHOD OF FORMING 1,2 DIPRIMARY DIAMINES WHICH COMPRISES ACYLATING THE AMINO GROUP OF AN AMINO MONONITRILE OF THE STRUCTURE
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) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |