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Patent US3549693A successfully refreshed from Google Patents.
US3549693A
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Process for producing acetoacetic acid esters
Assignee: Wacker Chemie AG
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Filing: 1968-01-03
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Granted: 1970-12-22
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Expires: 1988-01-03
Abstract
No abstract record available.
Inventors
- 👤 Herbert Eck
- 👤 Hellmuth Spes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:10
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/46; B; B01; B01J; B01J23/00; B01J23/02; B01J23/04; B01J27/00; B01J27/02; B01J27/053; B01J27/055; B01J27/06; B01J27/08; B01J27/20; B01J31/00; B01J31/02; B01J31/0231; B01J31/04; B01J2231/00; B01J2231/30; B01J2231/32; B01J2231/323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3445509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |