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 01:02
CPC Classifications
F; F16; F16K; F16K47/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US45390A
Cited
US490955A
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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 |