US2942071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horn-type transducer
Assignee: RCA Corp
•
Filing: 1954-10-01
•
Granted: 1960-06-21
•
Expires: 1974-10-01
Abstract
No abstract record available.
Inventors
- 👤 Albert L Witchey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:40
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1918164A
Cited
US1962374A
Cited
US1917012A
Cited
GB490750A
Cited
GB495784A
Cited
US2490227A
Cited
GB560219A
Cited
US2568883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |