US2583366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler with perforated cylinder containing inwardly and rearwardly inclined holes
Assignee: Individual
•
Filing: 1948-02-09
•
Granted: 1952-01-22
•
Expires: 1968-02-09
Abstract
No abstract record available.
Inventors
- 👤 Willard H Engels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:33
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE561675C
Cited
US1811762A
Cited
US1927213A
Cited
US2065343A
Cited
GB379563A
Cited
FR782848A
Cited
GB469155A
Cited
GB461065A
Cited
US2073951A
Cited
GB512075A
Cited
US2233804A
Cited
US2241150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |