US2818443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhydroxy compounds via anion-exchange resin catalyzed aldehyde condensation and subsequent hydrogenation
Assignee: Celanese Corp
•
Filing: 1955-01-17
•
Granted: 1957-12-31
•
Expires: 1975-01-17
Abstract
No abstract record available.
Inventors
- 👤 Max O Robeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/04; C07C49/17; B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; C07C29/00; C07C29/132; C07C29/136; C07C29/14; C07C29/141; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/75
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |