US622328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto ear-phone
Assignee: —
•
Filing: —
•
Granted: 1899-04-04
•
Expires: 1916-04-04
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/65; H04R25/652
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1902-04-04 | 1902-10-04 | 1903-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1906-04-04 | 1906-10-04 | 1907-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1910-04-04 | 1910-10-04 | 1911-04-05 | $7700.00 | Window Closed / Lapsed |