Patent US3531471A successfully refreshed from Google Patents.
US3531471A
Expired / Lapsed
US
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Process for preparing n-vinyl compounds
Assignee: Hoechst AG
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Filing: 1966-03-10
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Granted: 1970-09-29
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Expires: 1986-03-10
Abstract
No abstract record available.
Inventors
- 👤 Robert Hartwimmer
- 👤 Wolfram Schwiersch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:19
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07C; C07C233/00; C07D227/00; C07D227/02; C07D227/06; C07D227/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3336369A
Cited
US3377340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |