Patent US2444445A successfully refreshed from Google Patents.
US3518508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer
Assignee: Panasonic Holdings Corp
•
Filing: 1966-12-01
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Granted: 1970-06-30
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Expires: 1986-12-01
Abstract
No abstract record available.
Inventors
- 👤 Akio Yamashita
- 👤 Masaru Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:21
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3184347A
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US3102420A
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US3132408A
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US3310502A
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US3403307A
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US3387230A
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US3284750A
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US3372244A
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US3320568A
Cited
US3314035A
Cited
US3427410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |