US2702318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unidirectional microphone
Assignee: Astatic Corp
•
Filing: 1951-01-10
•
Granted: 1955-02-15
•
Expires: 1971-01-10
Abstract
No abstract record available.
Inventors
- 👤 Alexander L Dvorsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:48
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2104433A
Cited
US1964606A
Cited
US2001081A
Cited
US2126566A
Cited
US2444620A
Cited
US2512467A
Cited
US2493819A
Cited
US2515031A
Cited
US2587684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |