US3377340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing n-vinyl amides and n-vinyl lactams
Assignee: Hoechst AG
•
Filing: 1964-07-14
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Granted: 1968-04-09
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Expires: 1984-07-14
Abstract
No abstract record available.
Inventors
- 👤 Hartwimmer Robert
- 👤 Schwiersch Wolfram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:11
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2231905A
Cited
US2669570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |