US2540187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transducer and method for producing same
Assignee: Zenith Electronics LLC
•
Filing: 1950-05-02
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Granted: 1951-02-06
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Expires: 1970-05-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter L Cherry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:10
CPC Classifications
H; H04; H04R; H04R17/00; H10; H10N; H10N30/00; H10N30/01; H10N30/04; H10N30/045; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2281778A
Cited
US2486560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |