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Patent US3530270A successfully refreshed from Google Patents.
US3530270A
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US
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Electrical discharge machining apparatus
Assignee: Motors Liquidation Co
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Filing: 1966-08-30
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Granted: 1970-09-22
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Expires: 1986-08-30
Abstract
No abstract record available.
Inventors
- 👤 John J Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:51
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; B23H1/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2769078A
Cited
US3020448A
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US2981822A
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US3129357A
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US3217207A
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US3243567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |