US2798934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical spark machining devices
Assignee: Centre National de la Recherche Scientifique
•
Filing: 1955-02-07
•
Granted: 1957-07-09
•
Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 Bruma Marc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:41
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; B23H1/022
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1146988A
Cited
US1952505A
Cited
FR759864A
Cited
US2171512A
Cited
US2049377A
Cited
US2417622A
Cited
US2501954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |