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Patent US3388232A successfully refreshed from Google Patents.
US3388232A
Expired / Lapsed
US
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Electrical discharge machining method to obtain very close concentricities on a valve body
Assignee: Deutz Allis Corp
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Filing: 1965-04-22
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Granted: 1968-06-11
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Expires: 1985-04-22
Abstract
No abstract record available.
Inventors
- 👤 Dreisin Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:16
CPC Classifications
B; B23; B23H; B23H1/00
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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |