US3396812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic quarter wave tube
Assignee: Meritor Inc
•
Filing: 1967-07-05
•
Granted: 1968-08-13
•
Expires: 1987-07-05
Abstract
No abstract record available.
Inventors
- 👤 Wilcox Richard
- 👤 Beaman J Alson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:34
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2027359A
Cited
US2122447A
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US2189425A
Cited
US2297046A
Cited
US3209858A
Cited
FR1374264A
Cited
US3263772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |