Patent US3813441A successfully refreshed from Google Patents.
US3813441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous preparation of quaternary ammonium compounds
Assignee: Hoechst AG
•
Filing: 1970-02-19
•
Granted: 1974-05-28
•
Expires: 1990-02-19
Abstract
Abstract QUATERNARY AMMONIUM CHLORIDES OF AMINES HAVING AT LEAST ONE LONG ALIPHATIC CHAIN ARE OBTAINED BY REACTING CONTINOUSLY SAID AMINES WITH METHYL CHLORIDE IN THE PRESENCE OF ALKALI METAL HYDROXIDE AS ACID-BINDING AGENT WHILE MAINTAINING A METHYL CHLORIDE PARTIAL PRESSURE OF ABOUT 3 TO 10 ATMG., USING A REACTION MEDIUM CONSISTING OF FINAL PRODUCT AND A LOWER ALKANOL.
Inventors
- 👤 H Hubner
- 👤 K Ulm
- 👤 Schiedmayer G Mueller
- 👤 H Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:59
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/04; C07C209/06; C07C209/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |