US3514389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing a wear-resistant surface on a workpiece
Assignee: Wankel GmbH
•
Filing: 1968-09-06
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Granted: 1970-05-26
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Expires: 1988-09-06
Abstract
No abstract record available.
Inventors
- 👤 Gerhard Stephan
- 👤 Heinz Harst
- 👤 Gunter Laux
- 👤 Alfred Kappes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:16
CPC Classifications
C; C25; C25D; C25D15/00; C25D7/00; C25D7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1280249A
Cited
US1861446A
Cited
US1872290A
Cited
US2323952A
Cited
US2431949A
Cited
US2479323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |