US3495258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for spark discharge working of holes in electrically conductive workpieces
Assignee: Individual
•
Filing: 1967-02-20
•
Granted: 1970-02-10
•
Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Evgeny Vasilievich Kholodnov
- 👤 Boris Ivanovich Stavitsky
- 👤 Nikolai Vasilievich Lomov
- 👤 Jury Alexandrovich Shevelev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:33
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB824001A
Cited
US2773968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |