US3474818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined plug and check valve
Assignee: RALPH E HARTMAN
•
Filing: 1966-05-02
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Granted: 1969-10-28
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Expires: 1986-05-02
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:14
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/04; F16K5/045; F16K15/00; F16K15/18; F16K15/184; F16K15/1848; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5153; Y10T137/598; Y10T137/6031; Y10T137/6058; Y10T137/8593; Y10T137/87917; Y10T137/88022; Y10T137/8803; Y10T137/88054
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |