Patent US3026656A successfully refreshed from Google Patents.
Patent US3533438A successfully refreshed from Google Patents.
US3533438A
Expired / Lapsed
US
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Island check valve
Assignee: Individual
•
Filing: 1968-04-10
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Granted: 1970-10-13
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Expires: 1988-04-10
Abstract
No abstract record available.
Inventors
- 👤 Stuart B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:24
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/033; F16K15/035; F16K15/036; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7845; Y10T137/7846; Y10T137/7854; Y10T137/7856; Y10T137/8593; Y10T137/87265; Y10T137/87555
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |