US3434565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silencer with angled tuning tube leading to helmholtz resonator
Assignee: Walker Manufacturing Co
•
Filing: 1967-12-21
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Granted: 1969-03-25
•
Expires: 1987-12-21
Abstract
No abstract record available.
Inventors
- 👤 Richard L Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:27
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/003; F01N1/006; F01N1/02; F01N1/023; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA655470A
Cited
US2075263A
Cited
US2271055A
Cited
US2115103A
Cited
FR832486A
Cited
US2357792A
Cited
AT216292B
Cited
US3243012A
Cited
FR1374264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |