US3439623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump for power steering systems
Assignee: ZF Friedrichshafen AG
•
Filing: 1967-10-19
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Granted: 1969-04-22
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Expires: 1987-10-19
Abstract
No abstract record available.
Inventors
- 👤 Georg Dietrich
- 👤 Georg Kehrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:03
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/24; F04C14/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2544988A
Cited
US2853023A
Cited
US3253548A
Cited
US3059580A
Cited
US3236566A
Cited
US3311064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |