US3298394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Individual
•
Filing: 1963-03-29
•
Granted: 1967-01-17
•
Expires: 1983-03-29
Abstract
No abstract record available.
Inventors
- 👤 William J Chorkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:07
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/141; F16K15/142; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US881234A
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US1242515A
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US1366151A
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US2585556A
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US2614793A
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US2671466A
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US2790597A
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US3043325A
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US3155110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |