Patent US2679746A successfully refreshed from Google Patents.
Patent US2645899A successfully refreshed from Google Patents.
US2645899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydropneumatic pumping unit
Assignee: United States Steel Corp
•
Filing: 1950-12-06
•
Granted: 1953-07-21
•
Expires: 1970-12-06
Abstract
No abstract record available.
Inventors
- 👤 Aller T Dwight
- 👤 Paul E Noll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:22
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04; Y; Y10; Y10S; Y10S417/00; Y10S417/904
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1619474A
Cited
US2027104A
Cited
US2093690A
Cited
US2114005A
Cited
US2227814A
Cited
US2367248A
Cited
US2273721A
Cited
US2331046A
Cited
US2432305A
Cited
US2443301A
Cited
US2564285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |