Patent US4947432B1 successfully refreshed from Google Patents.
US4947432B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable hearing aid
Assignee: Topholm and Westermann ApS
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Filing: 1987-01-22
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Granted: 1993-03-09
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Expires: 2007-01-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:45
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/55; H04R25/558; H04R2225/00; H04R2225/61; H04R25/43
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) | 1996-03-08 | 1996-09-07 | 1997-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-08 | 2000-09-07 | 2001-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-08 | 2004-09-07 | 2005-03-09 | $7700.00 | Window Closed / Lapsed |