Patent US1882808A successfully refreshed from Google Patents.
US1882808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester interchange with organic acids
Assignee: EIDP Inc
•
Filing: 1928-10-12
•
Granted: 1932-10-18
•
Expires: 1948-10-12
Abstract
No abstract record available.
Inventors
- 👤 George D Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:22
CPC Classifications
A; A23; A23D; A23D9/00; A23D9/02; C; C07; C07C; C07C67/00; C07C67/03; C07C67/10; C07C67/48; C07C67/52; C07C67/54
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1935-10-18 | 1936-04-18 | 1936-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-10-18 | 1940-04-18 | 1940-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-10-18 | 1944-04-18 | 1944-10-18 | $7700.00 | Window Closed / Lapsed |