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Patent US2833868A successfully refreshed from Google Patents.
US2833868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone mounting for hearing aids
Assignee: Maico Electronics Inc
•
Filing: 1953-05-07
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Granted: 1958-05-06
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Expires: 1973-05-07
Abstract
No abstract record available.
Inventors
- 👤 John J Kojis
- 👤 William C Wilcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:15
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |