Patent US2990028A successfully refreshed from Google Patents.
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 15:20
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N1/00; F01N1/02; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
BE506100A
Cited
CH49795A
Cited
GB187171A
Cited
US1781503A
Cited
US2078420A
Cited
US2151470A
Cited
GB481480A
Cited
US2357792A
Cited
US2618355A
Cited
US2489585A
Cited
US2658580A
Cited
US2692025A
Cited
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 |