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Patent US3444205A successfully refreshed from Google Patents.
US3444205A
Expired / Lapsed
US
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Process for preparing continuously higher molecular secondary and tertiary amines
Assignee: Hoechst AG
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Filing: 1966-12-07
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Granted: 1969-05-13
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Expires: 1986-12-07
Abstract
No abstract record available.
Inventors
- 👤 Walter Frohlich
- 👤 Hans Oberrauch
- 👤 Kurt Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:35
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2436368A
Cited
US3217028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |