US2544536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone
Assignee: RCA Corp
•
Filing: 1947-05-28
•
Granted: 1951-03-06
•
Expires: 1967-05-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Kettler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:22
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1430256A
Cited
US1885001A
Cited
US1899994A
Cited
US2049586A
Cited
US2085721A
Cited
US1975283A
Cited
US2352305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |