US2502709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust muffler including plural venturi elements
Assignee: Individual
•
Filing: 1940-11-01
•
Granted: 1950-04-04
•
Expires: 1960-11-01
Abstract
No abstract record available.
Inventors
- 👤 Harley A Dorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:23
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/083; F01N1/003; F01N1/089
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1387614A
Cited
US1800354A
Cited
US1924605A
Cited
US1990837A
Cited
US2023024A
Cited
US2075088A
Cited
US2150768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |