USRE27487E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional hearing aid
Assignee: —
•
Filing: 1971-05-17
•
Granted: 1972-09-26
•
Expires: 1991-05-17
Abstract
Abstract A DIRECTIONAL HEARING AID WITH TWO MICROPHONES MOUNTED IN BACK RELATIONSHIP. AN ACOUSTIC RESILIENT ESAL DISPOSED ROUND THE APERTURE BETWEEN ONE OF THE MICROPONES AND A FORWARD FACING OPENING IN THE HOUSING. A FLEXIBLE CONDUIT IS DISPOSED BETWEEN THE OTHER MICROPHONE AND A REARWARD FACING OPENING IN THE HEARING AID.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:15
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/406; H04R25/00; H04R25/40; H04R25/402; H04R25/405
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |