US3823796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mufflers for internal combustion engines
Assignee: Individual
•
Filing: 1973-08-08
•
Granted: 1974-07-16
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Expires: 1993-08-08
Abstract
Abstract This invention relates to mufflers for internal combustion engines of all kinds. The invention provides means to break up the plane sound waves formed in the conduit between the engine and the muffler so as to absorb these waves wholly or in part near the point where the gas inlet conduit leads into the muffler. A vibratory diaphragm and a resonant cavity play important parts in arrangements according to the invention.
Inventors
- 👤 P Damiron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:31
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/02; F01N1/023; F01N1/16; F01N1/22; F01N2490/00; F01N2490/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A muffler for an internal combustion engine, said muffler comprising a casing fitted with a gas inlet conduit and a gas outlet conduit, a resonant cavity, an exhaust pipe connecting said resonant cavity to the atmosphere and constituting said gas outlet conduit, a vibratory diaphragm located between said gas inlet conduit and said resonant cavity, and means forming lateral passages surrounding said diaphragm to enable exhaust gas to flow away via said exhaust pipe.
Claim 2
Dependent Claim
74 words
A muffler for an internal combustion engine, said muffler comprising a casing fitted with a gas inlet conduit and a gas outlet conduit, a resonant cavity, an exhaust pipe connecting said resonant cavity to the atmosphere and constituting said gas outlet conduit, a vibratory diaphragm located between said gas inlet conduit and said resonant cavity, and means forming lateral passages surrounding said diaphragm to enable exhaust gas to flow away via said exhaust pipe.
Claim 3
Dependent Claim
46 words
A muffler according to claim 1, wherein said resonant cavity is divided into two chambers by a piston, said piston having a face which is close to said diaphragm and a constrictor space being provided around said piston to form a communication between said two chambers.
Claim 4
Dependent Claim
70 words
A muffler according to claim 2, wherein said muffler casing is divided into two chambers by said diaphragm resonant cavity assembly, said assembly being incorporated in a part which forms a divider means and is provided with lateral passages through which said two chambers communicate, one of said chambers surrounds said inlet conduit and containing a porous absorbent material and the other one of said chambers containing a gas-cleaning means.
Claim 5
Dependent Claim
14 words
A muffler according to claim 1 wherein said inlet conduit diverges towards saiD diaphragm.
Claim 6
Dependent Claim
14 words
A muffler according to claim 2 wherein said inlet conduit diverges towards said diaphragm.
Claim 7
Dependent Claim
37 words
A muffler according to claim 1, wherein said diaphragm/resonant cavity assembly incorporates a perforated flange which is fixed in the inside of said muffler casing by its periphery, said periphery being clamped between packing and adjusting washers.
Claim 8
Dependent Claim
47 words
A silencer according to claim 1, wherein a piston is mounted on a stem which screws into the wall of said resonant cavity and is secured by a lock-nut, said stem and said lock-nut facing said exhaust pipe so as to be accessible through said exhaust pipe.
References Cited (Backward Citations)
US863342A
Cited
US2198021A
Cited
US2419664A
Cited
FR1189403A
Cited
US3087579A
Cited
US3209857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |