US2228024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directive acoustic pickup
Assignee: Individual
•
Filing: 1940-02-01
•
Granted: 1941-01-07
•
Expires: 1960-02-01
Abstract
No abstract record available.
Inventors
- 👤 Alexander I Abrahams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:23
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/28; 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) | 1944-01-07 | 1944-07-08 | 1945-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-01-07 | 1948-07-08 | 1949-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-01-07 | 1952-07-08 | 1953-01-07 | $7700.00 | Window Closed / Lapsed |