Patent US2444615A successfully refreshed from Google Patents.
US2444615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eductor
Assignee: Derbyshire Machine & Tool Co
•
Filing: 1946-11-21
•
Granted: 1948-07-06
•
Expires: 1966-11-21
Abstract
No abstract record available.
Inventors
- 👤 Albrecht E Reinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:07
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/46; F04F5/467; B; B63; B63B; B63B13/00
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) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |