US2974169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Para-amino diphenylamine
Assignee: Uniroyal Inc
•
Filing: 1957-10-31
•
Granted: 1961-03-07
•
Expires: 1977-10-31
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Newby
- 👤 Byron A Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:56
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
IN A PROCESS OF PRODUCING P-AMINO DIPHENYLAMINE FROM P-NITROSO DIPHENYLAMINE THE IMPROVEMENT WHICH CONSISTS IN REDUCING AN ALKALI-METAL SALT OF P-NITROSO DIPHENYLAMINE TO P-AMINO DIPHENYLAMINE WITH HYDROGEN WHILE THE SAID METAL SALT IS DISSOLVED IN WATER, AND WHILE AGITATED WITH A HYDROGENATION CATALYST.
Claim 2
Dependent Claim
43 words
IN A PROCESS OF PRODUCING P-AMINO DIPHENYLAMINE FROM P-NITROSO DIPHENYLAMINE THE IMPROVEMENT WHICH CONSISTS IN REDUCING AN ALKALI-METAL SALT OF P-NITROSO DIPHENYLAMINE TO P-AMINO DIPHENYLAMINE WITH HYDROGEN WHILE THE SAID METAL SALT IS DISSOLVED IN WATER, AND WHILE AGITATED WITH A HYDROGENATION CATALYST.
References Cited (Backward Citations)
US2734808A
Cited
US2476170A
Cited
US2464044A
Cited
US2700060A
Cited
US2811555A
Cited
GB804113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |