US2978659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture-proof winding
Assignee: ELECTRO ENGINEERING WORKS
•
Filing: 1958-01-24
•
Granted: 1961-04-04
•
Expires: 1978-01-24
Abstract
No abstract record available.
Inventors
- 👤 Wallace W Wahlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:43
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1315365A
Cited
CA485526A
Cited
US1427324A
Cited
US2183550A
Cited
GB463676A
Cited
US2549770A
Cited
US2873304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |