US3395731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid conveyor switch
Assignee: National Engineering Co
•
Filing: 1965-06-07
•
Granted: 1968-08-06
•
Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 John H Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:57
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/58; B; B65; B65G; B65G53/00; B65G53/34; B65G53/52; B65G53/56; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87788; Y10T137/87804; Y10T137/87812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US850762A
Cited
DE482158C
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US2586144A
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US2900200A
Cited
US2907242A
Cited
US3154326A
Cited
US3132669A
Cited
US3115157A
Cited
US3089515A
Cited
US3174806A
Cited
US3298680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |