US1732722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directive-reception microphone
Assignee: Westinghouse Electric Corp
•
Filing: 1924-01-02
•
Granted: 1929-10-22
•
Expires: 1944-01-02
Abstract
No abstract record available.
Inventors
- 👤 Charles W Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/342
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) | 1932-10-21 | 1933-04-22 | 1933-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-10-21 | 1937-04-22 | 1937-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-10-21 | 1941-04-22 | 1941-10-22 | $7700.00 | Window Closed / Lapsed |