US3825598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyamines
Assignee: Bayer AG
•
Filing: 1972-06-21
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Granted: 1974-07-23
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Expires: 1992-06-21
Abstract
Abstract A CONTINUOUS PROCESS FOR THE PRODUCTION OF DIAMINERICH MIXTURES OF POLYAMINES OF THE POLYAMINO-POLYARYLPOLYMETHYLENE TYPE OBTAINED BY CONDENSING AROMATIC AMINES WITH FORMALDEHYDE OR FORMALDEHYDE PRECURSORS.
Inventors
- 👤 W Eifler
- 👤 J Finkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C07C209/78
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |