US2886693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark machining apparatus
Assignee: Individual
•
Filing: 1957-08-12
•
Granted: 1959-05-12
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Harris Michael John
- 👤 Townend Gordon Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:49
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2773168A
Cited
US2779859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |