US3813436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenylurea derivatives and process for their manufacture
Assignee: Novartis AG
•
Filing: 1971-05-19
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Granted: 1974-05-28
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Expires: 1991-05-19
Abstract
Abstract WHEREIN X REPRESENTS OXYGEN OR SULFUR, R1 REPRESENTS HYDROGEN. A LOWER ALKYL, ALKENYL, ALKINYL OR ALKOXY RADICAL WHEREIN X REPRESENTS OXYGEN OR SULFUR, R1 REPRESENTS HYDROGEN, A LOWER ALKYL, ALKENYL OR ALKOXY RADICAL, OR AND R2 REPRESENTS A LOWER ALKYL OR ALKENYL RADICAL, OR R1 AND R2 TOGETHER WITH THE NITROGEN ATOM WHICH THEY ARE BOUND FROM AN OPTIONALLY SUBSTITUTED HETEROCYLIC RING AND/OR A HETEROCYLIC RING INTERRUPTED BY OXYGEN OR SULFUR.
Inventors
- 👤 D Duerr
- 👤 E Nikles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:50
CPC Classifications
C; C07; C07C; C07C265/00; C07C265/12; C07C275/00; C07C275/28; C07C275/30; C07C335/00; C07C335/04; C07C335/16
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |