US2786102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earphone apparatus
Assignee: FRIEDER
•
Filing: 1952-11-06
•
Granted: 1957-03-19
•
Expires: 1972-11-06
Abstract
No abstract record available.
Inventors
- 👤 Leonard P Frieder
- 👤 Walter S Finken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/30; A42B3/16; A42B3/166; H; H04; H04R; H04R1/00; H04R1/10; H04R1/1058; H04R5/00; H04R5/033; H04R5/0335
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1367746A
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US1479017A
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US1426340A
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GB219081A
Cited
US2336669A
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US2468721A
Cited
US2468267A
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US2538419A
Cited
US2529562A
Cited
US2629095A
Cited
US2619639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |