US3436331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-chemical machining electrode
Assignee: Heppenstall Co
•
Filing: 1965-09-03
•
Granted: 1969-04-01
•
Expires: 1985-09-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Dietz
- 👤 Charles R Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:05
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3058895A
Cited
US3276988A
Cited
US3309303A
Cited
US3285844A
Cited
US3268434A
Cited
US3288698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |