US2990028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive muffler
Assignee: Walker Manufacturing Co
•
Filing: 1955-04-01
•
Granted: 1961-06-27
•
Expires: 1975-04-01
Abstract
No abstract record available.
Inventors
- 👤 Walter H Powers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:01
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N1/00; F01N1/02; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE506100A
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CH49795A
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US1781503A
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GB481480A
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US2618355A
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US2489585A
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US2658580A
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US2692025A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |