US2493734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic insert earphone insertable in the ear of the user
Assignee: Sonotone Corp
•
Filing: 1945-05-23
•
Granted: 1950-01-03
•
Expires: 1965-05-23
Abstract
No abstract record available.
Inventors
- 👤 Harry A Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:44
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/06; H04R2460/00; H04R2460/15; H04R2499/00; H04R2499/10; H04R2499/11; H04R25/00; H04R25/65
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |