US3427423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for electric discharge machining with air dielectric
Assignee: Easco Products Inc
•
Filing: 1964-08-05
•
Granted: 1969-02-11
•
Expires: 1984-08-05
Abstract
No abstract record available.
Inventors
- 👤 Thomas J O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:35
CPC Classifications
B; B23; B23H; B23H1/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2308860A
Cited
US2427588A
Cited
US2385665A
Cited
US2718581A
Cited
US3035151A
Cited
US3144541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |