US3576876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of o-phenylenediamines
Assignee: Monsanto Chemicals Australia Ltd
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Filing: 1966-12-07
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Granted: 1971-04-27
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Expires: 1986-12-07
Abstract
Abstract A PROCESS FOR THE PREPARATION OF O-PHENYLENEDIAMINES WHICH COMPRISES CONTACTING AN O-NITROANILINE IN THE VAPOR OR GASEOUS PHASE WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST.
Inventors
- 👤 William G C Raper
- 👤 Henry P Crocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:55
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |