US3306393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler with chambers formed by three concentric tubes
Assignee: Walker Manufacturing Co
•
Filing: 1964-11-25
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Granted: 1967-02-28
•
Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Eldred G Straw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:40
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1838; F01N13/1844; F01N13/185; F01N2450/00; F01N2450/20; F01N2450/22; F01N2470/00; F01N2470/02; F01N2470/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A MUFFLER FOR SILENCING SOUND IN FLOWING GASES COMPRISING AN ELONGATED TUBULAR HOUSING HAVING ANNULAR REDUCED DIAMETER PORTIONS AT OPPOSITE ENDS FORMING A GAS INLET AND A GAS OUTLET, A PERFORATE GAS FLOW TUBE EXTENDING THROUGH SAID HOUSING AND HAVING OPPOSITE ENDS SUPPORTED IN SAID REDUCED DIAMETER PORTIONS, AN INTERMEDIATE TUBE IN SAID HOUSING AROUND AT LEAST A PORTION OF THE LENGHT OF THE FLOW TUBE, SAID TUBES AND HOUSING BEING SUBSTANTIALLY COAXIAL, SAID HOUSING HAVING A RADIALLY EXTENDING ANNULAR TUBE SUPPORT AND PARTITION PORTION ENGAGING THE OUTSIDE OF SAID INTERMEDIATE TUBE COMPRISING AN ANNULAR INWARDLY EXTENDING FOLD OF A U-SHAPED CROSS SECTION WHEREIN THE OPPOSITE LEGS OF THE U ARE SUBSTANTIALLY IN CONTACT WITH EACH OTHER.
Claim 2
Dependent Claim
117 words
A MUFFLER FOR SILENCING SOUND IN FLOWING GASES COMPRISING AN ELONGATED TUBULAR HOUSING HAVING ANNULAR REDUCED DIAMETER PORTIONS AT OPPOSITE ENDS FORMING A GAS INLET AND A GAS OUTLET, A PERFORATE GAS FLOW TUBE EXTENDING THROUGH SAID HOUSING AND HAVING OPPOSITE ENDS SUPPORTED IN SAID REDUCED DIAMETER PORTIONS, AN INTERMEDIATE TUBE IN SAID HOUSING AROUND AT LEAST A PORTION OF THE LENGHT OF THE FLOW TUBE, SAID TUBES AND HOUSING BEING SUBSTANTIALLY COAXIAL, SAID HOUSING HAVING A RADIALLY EXTENDING ANNULAR TUBE SUPPORT AND PARTITION PORTION ENGAGING THE OUTSIDE OF SAID INTERMEDIATE TUBE COMPRISING AN ANNULAR INWARDLY EXTENDING FOLD OF A U-SHAPED CROSS SECTION WHEREIN THE OPPOSITE LEGS OF THE U ARE SUBSTANTIALLY IN CONTACT WITH EACH OTHER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |