Patent US1259882A successfully refreshed from Google Patents.
Patent US2419681A successfully refreshed from Google Patents.
US2419681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circulating pump sealing system
Assignee: De Laval Steam Turbine Co
•
Filing: 1944-01-08
•
Granted: 1947-04-29
•
Expires: 1964-01-08
Abstract
No abstract record available.
Inventors
- 👤 Gartmann Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/106; F04D29/108
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1986706A
Cited
US2169934A
Cited
US2170790A
Cited
US2169935A
Cited
US2271353A
Cited
US2393691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-28 | 1950-10-28 | 1951-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-28 | 1954-10-28 | 1955-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-28 | 1958-10-28 | 1959-04-29 | $7700.00 | Window Closed / Lapsed |