US1939224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of sublimable organic material
Assignee: Selden Co
•
Filing: 1931-01-26
•
Granted: 1933-12-12
•
Expires: 1951-01-26
Abstract
No abstract record available.
Inventors
- 👤 Kurt F Pietzsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:21
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0018; B01D9/0022; B01D9/0036; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/11; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
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) | 1936-12-11 | 1937-06-12 | 1937-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-11 | 1941-06-12 | 1941-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-11 | 1945-06-12 | 1945-12-12 | $7700.00 | Window Closed / Lapsed |