Patent US2991333A successfully refreshed from Google Patents.
US2991333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical device
Assignee: Maico Electronics Inc
•
Filing: 1960-09-02
•
Granted: 1961-07-04
•
Expires: 1980-09-02
Abstract
No abstract record available.
Inventors
- 👤 John F Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:21
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604; H04R2225/00; H04R2225/021; H04R2225/0213; H04R25/603; H04R25/609
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |