Patent US2525508A successfully refreshed from Google Patents.
US2525508A
Expired / Lapsed
US
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Nitration of o-substituted aromatic amines
Assignee: GAF Chemicals Corp
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Filing: 1945-05-05
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Granted: 1950-10-10
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Expires: 1965-05-05
Abstract
No abstract record available.
Inventors
- 👤 Bernhard G Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:00
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C07C209/76; C07C201/00; C07C201/06; C07C201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
THE PROCESS OF PRODUCING 5 NITRO DERIVATIVES OF ORTHO-SUBSTITUTED AROMATIC AMINES OF THE FORMULA
Claim 2
Dependent Claim
14 words
THE PROCESS OF PRODUCING 5 NITRO DERIVATIVES OF ORTHO-SUBSTITUTED AROMATIC AMINES OF THE FORMULA
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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |