US3383631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic impedance matching
Assignee: Zenith Electronics LLC
•
Filing: 1965-09-16
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Granted: 1968-05-14
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Expires: 1985-09-16
Abstract
No abstract record available.
Inventors
- 👤 Korpel Adrianus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:44
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02; Y; Y10; Y10S; Y10S181/00; Y10S181/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |