Patent US1421221A successfully refreshed from Google Patents.
Patent US4443895A successfully refreshed from Google Patents.
US2456133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump for gaseous working fluids
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1944-02-11
•
Granted: 1948-12-14
•
Expires: 1964-02-11
Abstract
No abstract record available.
Inventors
- 👤 Lipscomb Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:50
CPC Classifications
F; F04; F04B; F04B45/00; F04B45/04; F04B45/043; F04B45/08; F04B45/10
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) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |