Patent US4503597A successfully refreshed from Google Patents.
Patent US4467187A successfully refreshed from Google Patents.
Patent US2022384A successfully refreshed from Google Patents.
US2022384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid seal
Assignee: Celanese Corp
•
Filing: 1932-03-08
•
Granted: 1935-11-26
•
Expires: 1952-03-08
Abstract
No abstract record available.
Inventors
- 👤 Fred W Paffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:30
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/112; B01F27/1122; B01F27/80; B01F27/90; B01F27/906; B01F35/00; B01F35/40; B01F35/41; B01F35/411; B01F35/4111; B01F35/30; B01F2035/35; B01F2035/351; B01F2035/3512; B01F35/33
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) | 1938-11-25 | 1939-05-27 | 1939-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-25 | 1943-05-27 | 1943-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-25 | 1947-05-27 | 1947-11-26 | $7700.00 | Window Closed / Lapsed |