US3368644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aid tone tuning device and method
Assignee: Individual
•
Filing: 1966-03-28
•
Granted: 1968-02-13
•
Expires: 1986-03-28
Abstract
No abstract record available.
Inventors
- 👤 John D Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:17
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/48; G; G02; G02C; G02C11/00; G02C11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN A HEARING AID, A TUNING DEVICE COMPRISING AN ELASTICALLY DEFORMABLE EAR INSERT HAVING A RESTRICTED PASSAGE THROUGH IT, AND A TUBULAR LINER OF RELATIVELY LESS ELASTIC MATERIAL EXTENDING INTO SAID EAR INSERT THROUGH AT LEAST A PORTION OF THE PASSAGE AND ADJUSTABLE IN ADVANCE LONGITUDINALLY THEREOF, THE LINER HAVING AN EXTERNAL CROSS SECTION GREATER THAN THE INITIAL RESTRICTED CROSS SECTION OF
Claim 2
Dependent Claim
62 words
IN A HEARING AID, A TUNING DEVICE COMPRISING AN ELASTICALLY DEFORMABLE EAR INSERT HAVING A RESTRICTED PASSAGE THROUGH IT, AND A TUBULAR LINER OF RELATIVELY LESS ELASTIC MATERIAL EXTENDING INTO SAID EAR INSERT THROUGH AT LEAST A PORTION OF THE PASSAGE AND ADJUSTABLE IN ADVANCE LONGITUDINALLY THEREOF, THE LINER HAVING AN EXTERNAL CROSS SECTION GREATER THAN THE INITIAL RESTRICTED CROSS SECTION OF
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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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |