Patent US2660256A successfully refreshed from Google Patents.
US2660256A
Expired / Lapsed
US
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Exhaust muffler with expansion chamber
Assignee: Individual
•
Filing: 1950-02-14
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Granted: 1953-11-24
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Expires: 1970-02-14
Abstract
No abstract record available.
Inventors
- 👤 Walker George Bromhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:42
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/086; F01N1/088; F01N1/003; F01N3/00; F01N3/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE563018C
Cited
US753845A
Cited
GB190709297A
Cited
US1157256A
Cited
US1671829A
Cited
FR701684A
Cited
US2075265A
Cited
GB487816A
Cited
US2511597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |