Patent US2987584A successfully refreshed from Google Patents.
US2987584A
Expired / Lapsed
US
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In-ear hearing aid
Assignee: Individual
•
Filing: 1958-11-28
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Granted: 1961-06-06
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Expires: 1978-11-28
Abstract
No abstract record available.
Inventors
- 👤 Melvyn E Webber
- 👤 Skarzynski David
- 👤 Thomas F Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:55
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/65; H04R25/652; H04R25/45; H04R25/456; H04R2225/00; H04R2225/023; H04R25/658
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2430229A
Cited
US2485405A
Cited
US2792457A
Cited
GB737115A
Cited
US2787670A
Cited
GB788099A
Cited
US2930858A
Cited
US2858466A
Cited
US2882348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |