Patent US2729317A successfully refreshed from Google Patents.
US2729317A
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US
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Friction disc clutches
Assignee: ZF Friedrichshafen AG
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Filing: 1951-03-14
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Granted: 1956-01-03
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Expires: 1971-03-14
Abstract
No abstract record available.
Inventors
- 👤 Schwab Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:01
CPC Classifications
F; F16; F16D; F16D13/00; F16D13/22; F16D13/38; F16D13/52; F16D13/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE92693C
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US1632526A
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US1958070A
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DE651815C
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FR885445A
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FR908979A
Cited
FR924404A
Cited
US2639013A
Cited
US2593521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |