US3183274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trimethylolpropane
Assignee: Celanese Corp
•
Filing: 1956-10-09
•
Granted: 1965-05-11
•
Expires: 1976-10-09
Abstract
No abstract record available.
Inventors
- 👤 Max O Robeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:49
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
PROCESS FOR THE PRODUCTION OF TRIMETHYLOLPROPANE WHICH COMPRISES CONTINUOUSLY REACTING, IN AN AQUEOUS MEDIUM, A MIXTURE OF BUTYRALDEHYDE, FORMALDEHYDE AND SODIUM HYDROXIDE, THERE BEING ABOUT 6 TO 10 MOLES OF FORMALDEHYDE PER MOLE OF BUTYRALDEHYDE, TO PRODUCE TRIMETRHYLOLPROPANE AND SODIUM FORMATE AND SEPARATING THE TRIMETHYLOLPROPANE FROM THE SODIUM FORMATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-10 | 1968-11-09 | 1969-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-10 | 1972-11-09 | 1973-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-10 | 1976-11-09 | 1977-05-11 | $7700.00 | Window Closed / Lapsed |