US2579162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded condenser microphone
Assignee: Altec Lansing Corp
•
Filing: 1950-02-24
•
Granted: 1951-12-18
•
Expires: 1970-02-24
Abstract
No abstract record available.
Inventors
- 👤 Paul S Veneklasen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:50
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1780671A
Cited
US1988001A
Cited
US2113347A
Cited
US2321370A
Cited
US2396691A
Cited
US2445821A
Cited
US2465288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |