US3550045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic surface wave filter devices
Assignee: Zenith Electronics LLC
•
Filing: 1969-06-25
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Granted: 1970-12-22
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Expires: 1989-06-25
Abstract
No abstract record available.
Inventors
- 👤 Robert Adler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:54
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6489; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/1455; H03H9/6423; H03H9/6426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2886787A
Cited
US3401360A
Cited
US3360749A
Cited
US3376572A
Cited
US3334307A
Cited
US3479572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |