US2974168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making methylenedianiline
Assignee: Monsanto Chemicals Ltd
•
Filing: 1955-09-19
•
Granted: 1961-03-07
•
Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Dexter B Sharp
- 👤 Floyd B Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C07C209/78; C07C209/82; C07C209/84; C07C211/00; C07C211/33; C07C211/39; C07C211/41; C07C211/42; C07C211/43; C07C211/44; C07C211/49; C07C211/50; C07C2602/00; C07C2602/02; C07C2602/04; C07C2602/10
Claims Analysis
Total Claims: 0
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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 |