Patent US3515659A successfully refreshed from Google Patents.
US3515659A
Expired / Lapsed
US
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Apparatus for electro chemical machining
Assignee: ZF Active Safety US Inc
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Filing: 1967-01-30
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Granted: 1970-06-02
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Expires: 1987-01-30
Abstract
No abstract record available.
Inventors
- 👤 Robert C Broat
- 👤 Walter H Krupa
- 👤 George William Cooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:40
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2765394A
Cited
US3095364A
Cited
US3305470A
Cited
US3271283A
Cited
US3288699A
Cited
US3403084A
Cited
US3390068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |