US2299157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for silencing air intakes of internal combustion engines
Assignee: Donaldson Co Inc
•
Filing: 1940-09-27
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Granted: 1942-10-20
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Expires: 1960-09-27
Abstract
No abstract record available.
Inventors
- 👤 Wilfred W Lowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:28
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10013; F02M35/10242; F02M35/10288; F02M35/12; F02M35/1205; F02M35/1222; F02M35/1227; F02M35/1288; F02M35/16; F02M35/161; Y; Y10; Y10S; Y10S55/00; Y10S55/21; Y10S55/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-10-19 | 1946-04-20 | 1946-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-19 | 1950-04-20 | 1950-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-19 | 1954-04-20 | 1954-10-20 | $7700.00 | Window Closed / Lapsed |