Patent US3513270A successfully refreshed from Google Patents.
US3513270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone diaphragm including spacer means between diaphragm and voice coil
Assignee: Sennheiser Electronic GmbH and Co KG
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Filing: 1966-05-09
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Granted: 1970-05-19
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Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Paul-Friedrich Warning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:15
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/127; H04R9/00; H04R9/02; H04R9/04; H04R9/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |