US2217279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic apparatus
Assignee: RCA Corp
•
Filing: 1938-07-23
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Granted: 1940-10-08
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Expires: 1958-07-23
Abstract
No abstract record available.
Inventors
- 👤 Melvin E Karns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:47
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2869; H04R1/2876; H04R1/288; B; B66; B66F; B66F3/00; B66F3/08; H04R1/26; B66F2700/00; B66F2700/04
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) | 1943-10-08 | 1944-04-08 | 1944-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-08 | 1948-04-08 | 1948-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-08 | 1952-04-08 | 1952-10-08 | $7700.00 | Window Closed / Lapsed |