Patent US2394023A successfully refreshed from Google Patents.
US2394023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packed tower
Assignee: CHEMICAL DEVELOPMENTS Corp
•
Filing: 1944-01-05
•
Granted: 1946-02-05
•
Expires: 1964-01-05
Abstract
No abstract record available.
Inventors
- 👤 Strickland Elizabeth Deems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/30; B01J2219/00; B01J2219/30; B01J2219/302; B01J2219/30207
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) | 1949-02-04 | 1949-08-06 | 1950-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-02-04 | 1953-08-06 | 1954-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-02-04 | 1957-08-06 | 1958-02-05 | $7700.00 | Window Closed / Lapsed |