Patent US2544284A successfully refreshed from Google Patents.
US2544284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler with plural perforated passages
Assignee: Fluor Corp
•
Filing: 1947-05-05
•
Granted: 1951-03-06
•
Expires: 1967-05-05
Abstract
No abstract record available.
Inventors
- 👤 Foster M Stephens
- 👤 Bartels Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:52
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1838; F01N13/1844; F01N1/00; F01N1/08; F01N1/084; F01N2260/00; F01N2260/18; F01N2450/00; F01N2450/22; F01N2470/00; F01N2470/02; F01N2470/30; F01N2490/00; F01N2490/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1468398A
Cited
GB342364A
Cited
US2016254A
Cited
US2051675A
Cited
US2264195A
Cited
US2397208A
Cited
US2445045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |