US2417839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of rectifier discs
Assignee: International Standard Electric Corp
•
Filing: 1943-11-20
•
Granted: 1947-03-25
•
Expires: 1963-11-20
Abstract
No abstract record available.
Inventors
- 👤 Richards Edward Arthur
- 👤 Ellison Leslie James
- 👤 Gray Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:34
CPC Classifications
H; H10; H10W; H10W72/00; H10D; H10D48/00; H10D48/01; H10D48/04; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-24 | 1950-09-23 | 1951-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-24 | 1954-09-23 | 1955-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-24 | 1958-09-23 | 1959-03-25 | $7700.00 | Window Closed / Lapsed |