US3485319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas converter or muffler tube with staggered louvers
Assignee: Walker Manufacturing Co
•
Filing: 1967-12-21
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Granted: 1969-12-23
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Expires: 1987-12-21
Abstract
No abstract record available.
Inventors
- 👤 Robert N Balluff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:11
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1838; F01N13/1844; F01N13/185; F01N13/1855; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2839; F01N3/2846; F01N2330/00; F01N2330/08; F01N2450/00; F01N2450/20; F01N2450/22; F01N2450/24; F01N2470/00; F01N2470/02; F01N2470/04; F01N2470/06; F01N2470/10; F01N2470/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2038309A
Cited
US2066467A
Cited
US2251880A
Cited
US2182204A
Cited
US2251369A
Cited
US2642147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |