US3440364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker magnet having curved preferred direction of magnetization
Assignee: General Electric Co
•
Filing: 1965-12-21
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Granted: 1969-04-22
•
Expires: 1985-12-21
Abstract
No abstract record available.
Inventors
- 👤 Rollin J Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025; H01; H01F; H01F13/00; H01F13/003; H01F7/00; H01F7/02; H01F7/0273; H01F7/0289
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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |