Patent US3447778A successfully refreshed from Google Patents.
US3447778A
Expired / Lapsed
US
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Variable flow metering device
Assignee: ZF International UK Ltd
•
Filing: 1966-04-06
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Granted: 1969-06-03
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Expires: 1986-04-06
Abstract
No abstract record available.
Inventors
- 👤 Harry Simister Bottoms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:39
CPC Classifications
F; F16; F16K; F16K39/00; F16K3/00; F16K3/22; F16K3/24; F16K3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123335A
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CA762317A
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US2141428A
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US2925242A
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US2755815A
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US2780443A
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US3004555A
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US3094306A
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US3009480A
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US3189048A
Cited
US3204656A
Cited
US3358964A
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 |