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US2949931A
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Magnetic check valve
Assignee: Raytheon Co
•
Filing: 1958-01-29
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Granted: 1960-08-23
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Expires: 1978-01-29
Abstract
No abstract record available.
Inventors
- 👤 Ruppright Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:21
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K31/00; F16K31/02; F16K31/06; F16K31/08; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7857; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913; Y10T137/7914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1047195A
Cited
US1160707A
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US1328057A
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US1792509A
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US2221983A
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US2385578A
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US2597952A
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US2646071A
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US2652520A
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US2797704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |