Patent US3619286A successfully refreshed from Google Patents.
US3619286A
Expired / Lapsed
US
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Cast graphite electrodes for edm applications
Assignee: ThyssenKrupp Budd Co
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Filing: 1968-12-18
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Granted: 1971-11-09
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Expires: 1988-12-18
Abstract
Abstract A no-wear graphite electrode for electrodischarge machining. The electrode is cast from powdered graphite mixed with a binder. The mixture is cast in a mold and subsequently fired. After firing, it is coated with pyrolytic graphite.
Inventors
- 👤 Ludwik Gutnajer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:28
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/04; B23H1/06; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |