US2996601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of metal articles by electrospark erosion
Assignee: Wickman Ltd
•
Filing: 1958-02-17
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Granted: 1961-08-15
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Expires: 1978-02-17
Abstract
No abstract record available.
Inventors
- 👤 Sweetman Ernest Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:06
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/001; B23Q; B23Q1/00; B23Q1/25; B23Q1/26; B23Q1/34; B23Q1/36; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; F16C2322/00; F16C2322/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2066588A
Cited
US2078310A
Cited
US2273819A
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US2490302A
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US2908801A
Cited
FR1167320A
Cited
US2945936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |