US3749751A
Expired / Lapsed
US
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Reducing free formaldehyde content in methylolated carbamates
Assignee: BASF SE
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Filing: 1971-08-30
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Granted: 1973-07-31
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Expires: 1991-08-30
Abstract
Abstract THE FREE FORMALDEHYDE CONTENT OF METHYLOTATED CARBAMATES IS REDUCED BY CONTACTING AN AQUEOUS SOLUTION OF THE METHYLOLATED CARBAMATE WITH A NITROGENOUS CARBONYL COMPOUND HAVING A CC(O)N(H) GROUP, E.G., A PYRROLIDONE, IN THE PRESENCE OF A CAUSTIC.
Inventors
- 👤 P Pai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:11
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |