Patent US3447568A successfully refreshed from Google Patents.
US3447568A
Expired / Lapsed
US
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Electromagnetically operated sequential valves
Assignee: WERNER BAYERSDORFER NR
•
Filing: 1966-07-18
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Granted: 1969-06-03
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Expires: 1986-07-18
Abstract
No abstract record available.
Inventors
- 👤 Hermann Burkart
- 👤 Harro Dorner
- 👤 Werner Bayersdorfer Nr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:08
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0603; F16K31/0624; F16K39/00; F16K39/02; F16K39/024; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86968; Y10T137/86984
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2213488A
Cited
US2265496A
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US2413622A
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US2694405A
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US3332445A
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US3213887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |