US2827595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for machining, by means of electric sparks, pieces made of electricity conducting materials
Assignee: Centre National de la Recherche Scientifique
•
Filing: 1954-07-01
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Granted: 1958-03-18
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Bruma Marc
- 👤 Magat Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; B23H1/022; B23H2300/00; B23H2300/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1123118A
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US2072278A
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US2628330A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |