US2988714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric filter network
Assignee: General Electric Co
•
Filing: 1957-09-12
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Granted: 1961-06-13
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Expires: 1977-09-12
Abstract
No abstract record available.
Inventors
- 👤 Stephen W Tehon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:11
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/542; H03H9/58; H03H9/60; H10; H10N; H10N30/00; H10N30/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1978475A
Cited
FR796611A
Cited
US2199921A
Cited
US2248776A
Cited
US2253942A
Cited
US2373431A
Cited
US2830274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |