US3638756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle muffler and method of assembly
Assignee: United States Steel Corp
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Filing: 1969-12-30
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Granted: 1972-02-01
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Expires: 1989-12-30
Abstract
Abstract A muffler for vehicles propelled by internal combustion engines. The muffler is formed of two pieces, preferably metal stampings, in which the various chambers and passages are indented or embossed. The two pieces are joined at their peripheral edges. The muffler is tuned by adjusting the relative size and arrangement of chambers and passages. In one modification the position of the pieces may be adjusted relatively to each other to permit variable tuning.
Inventors
- 👤 Robert E Thiele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:05
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1872; F01N13/1877; F01N1/00; F01N1/02; F01N1/08; F01N1/089; F01N13/1838; F01N13/1888; F01N2470/00; F01N2470/06; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A vehicle muffler comprising mating top and bottom pieces and means joining said pieces at their peripheral edges, said pieces having indentations defining one or more mixing chambers, and an inlet and outlet communicating with said chambers, whereby the level of noise accompanying gases introduced through said inlet is lowered and the resultant noise tuned to be characteristic of the vehicle, a low point being provided in the muffler to facilitate drainage.
Claim 2
Dependent Claim
72 words
A vehicle muffler comprising mating top and bottom pieces and means joining said pieces at their peripheral edges, said pieces having indentations defining one or more mixing chambers, and an inlet and outlet communicating with said chambers, whereby the level of noise accompanying gases introduced through said inlet is lowered and the resultant noise tuned to be characteristic of the vehicle, a low point being provided in the muffler to facilitate drainage.
Claim 3
Dependent Claim
45 words
A muffler as defined in claim 1 in which said pieces are metal stampings and the means joining the stampings include lips extending around their peripheries, and in which said indentations define at least two mixing chambers and means affording restricted communication between said chambers.
Claim 4
Dependent Claim
22 words
A muffler as defined in claim 2 in which said pieces can be adjusted relatively to each other to permit variable tuning.
Claim 5
Dependent Claim
116 words
A vehicle muffler comprising: mating top and bottom metal stampings having lips extending around their peripheral edges and a plurality of indentations; means joining said stampings at said lips; said indentations defining first and second mixing chambers, a distribution chamber between said mixing chambers, and lengthwise passages along each side of said chambers, said distribution chamber communicating with one of said mixing chambers and with said passages, said passages having restricted communication with both said mixing chambers; and an inlet and an outlet communicating with said first and second mixing chambers respectively, whereby the level of noise accompanying gases introduced through said inlet is lowered and the resultant noise tuned to be characteristic of the vehicle.
Claim 6
Dependent Claim
116 words
A vehicle muffler comprising: mating top and bottom metal stampings having lips extending around their peripheral edges and a plurality of indentations; means joining said stampings at said lips; said indentations defining first and second mixing chambers, a distribution chamber between said mixing chambers, and lengthwise passages along each side of said chambers, said distribution chamber communicating with one of said mixing chambers and with said passages, said passages having restricted communication with both said mixing chambers; and an inlet and an outlet communicating with said first and second mixing chambers respectively, whereby the level of noise accompanying gases introduced through said inlet is lowered and the resultant noise tuned to be characteristic of the vehicle.
Claim 7
Dependent Claim
31 words
A muffler as defined in claim 4 in which said pieces have embossments between said mixing chambers and said passages defining restricted openings which slant in the direction of gas flow.
Claim 8
Dependent Claim
53 words
A muffler as defined in claim 5 in which the wall between said distribution chamber and said second mixing chamber is adapted to direct high-frequency sound waves into said passages, and said restricted openings are adapted to conduct low-frequency sound waves into said passages, where the high and low frequency sound waves blend.
Claim 9
Dependent Claim
74 words
A vehicle muffler comprising mAting top and bottom pieces having lips extending around their peripheral edges, said lips having interfitting indentations, brazing material interposed between said interfitting indentations joining said pieces, said pieces having indentations defining one or more mixing chambers and an inlet and outlet communicating with said chambers, whereby the level of noise accompanying gases introduced through said inlet is lowered and the resultant noise tuned to be characteristic of the vehicle.
Claim 10
Dependent Claim
74 words
A vehicle muffler comprising mAting top and bottom pieces having lips extending around their peripheral edges, said lips having interfitting indentations, brazing material interposed between said interfitting indentations joining said pieces, said pieces having indentations defining one or more mixing chambers and an inlet and outlet communicating with said chambers, whereby the level of noise accompanying gases introduced through said inlet is lowered and the resultant noise tuned to be characteristic of the vehicle.
Claim 11
Dependent Claim
18 words
A muffler as defined in claim 7 in which said pieces are metal stampings internally coated with porcelain.
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |