Patent US2509671A successfully refreshed from Google Patents.
US2509671A
Expired / Lapsed
US
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Slide valve
Assignee: Individual
•
Filing: 1946-02-01
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Granted: 1950-05-30
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Expires: 1966-02-01
Abstract
No abstract record available.
Inventors
- 👤 Niels A Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:41
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0712
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US970225A
Cited
US1944739A
Cited
US2071204A
Cited
US2178828A
Cited
US2180795A
Cited
US2445505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |