Patent US3037522A successfully refreshed from Google Patents.
US3037522A
Expired / Lapsed
US
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Check valve construction
Assignee: Otto Items Inc
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Filing: 1958-04-04
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Granted: 1962-06-05
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Expires: 1978-04-04
Abstract
No abstract record available.
Inventors
- 👤 Millan Robert Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:19
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/148; F16K15/1402; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7772; Y10T137/7773; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/784; Y10T137/7879; Y10T137/7888; Y10T137/789
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2008818A
Cited
US2291603A
Cited
US2620133A
Cited
US2663540A
Cited
US2688978A
Cited
US2747922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |