Patent US2930573A successfully refreshed from Google Patents.
US2930573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Half ball valves
Assignee: Napier Turbochargers Ltd
•
Filing: 1957-06-04
•
Granted: 1960-03-29
•
Expires: 1977-06-04
Abstract
No abstract record available.
Inventors
- 👤 Skellern John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:12
CPC Classifications
F; F16; F16K; F16K47/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US45390A
Cited
US490955A
Cited
US665083A
Cited
US732776A
Cited
US1357667A
Cited
US1619937A
Cited
US1720389A
Cited
FR732530A
Cited
US2096202A
Cited
US2461909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |