Patent US2552309A successfully refreshed from Google Patents.
US2552309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic diaphragm and baffle
Assignee: RCA Corp
•
Filing: 1947-10-10
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Granted: 1951-05-08
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Expires: 1967-10-10
Abstract
No abstract record available.
Inventors
- 👤 Wendell L Carlson
- 👤 Loy E Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:34
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/028; H04R1/021; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2811; H04R1/2869; H04R1/2876; H04R1/288
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |