Patent US3003191A successfully refreshed from Google Patents.
US3003191A
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US
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Method of making a transducer diaphragm
Assignee: Individual
•
Filing: 1958-09-02
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Granted: 1961-10-10
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Expires: 1978-09-02
Abstract
No abstract record available.
Inventors
- 👤 Harold J Luth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:10
CPC Classifications
H; H04; H04R; H04R31/00; H04R31/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733774A
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US1759387A
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US2146975A
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US2114701A
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US2291616A
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US2406678A
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US2617126A
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US2640556A
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US2719795A
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US2739350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |