Patent US3322929A successfully refreshed from Google Patents.
US3322929A
Expired / Lapsed
US
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Method of eroding cavities by electric discharge machining
Assignee: AT&T Teletype Corp
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Filing: 1963-06-27
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Granted: 1967-05-30
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Expires: 1983-06-27
Abstract
No abstract record available.
Inventors
- 👤 William J Mayer
- 👤 Carl E Nordstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:32
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18; B23H7/26; B23H7/28
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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |