Patent US3476744A successfully refreshed from Google Patents.
US3476744A
Expired / Lapsed
US
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Process for the purification of lactams
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1966-06-07
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Granted: 1969-11-04
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Expires: 1986-06-07
Abstract
No abstract record available.
Inventors
- 👤 Clau Berther
- 👤 Richard Sailer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:39
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/16; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0488; B01D9/00; B01D9/0036; B01D9/0059
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |