US3497642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer diaphragm imbedded with conductively-coated ferromagnetic particles
Assignee: Intron International Inc
•
Filing: 1966-02-28
•
Granted: 1970-02-24
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Expires: 1986-02-28
Abstract
No abstract record available.
Inventors
- 👤 Robert H Pintell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:52
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2847; H01F27/2804; H01F30/00; H01F30/02; H01F30/06; H01F30/10; H04; H04R; H04R13/00; H04R7/00; H04R7/02; H04R7/12; H04R7/14; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H04R9/047; H01F17/00; H01F17/0006; H01F2017/006; H01F2027/2857
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2044608A
Cited
US2933415A
Cited
US3013905A
Cited
US3066200A
Cited
US3141071A
Cited
US3209084A
Cited
US3118022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |