Patent US3693602A successfully refreshed from Google Patents.
US3693602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with sound-proofing casing
Assignee: Individual
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Filing: 1970-09-15
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Granted: 1972-09-26
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Expires: 1990-09-15
Abstract
Abstract A sound-proofed internal combustion engine having a casing spaced around the engine and having a cooling-air blower driven by the engine arranged inside the casing with inlet and outlet in the casing and an exhaust pipe extending through the casing and exposed to the cooling-air stream of the blower to produce both a sound proofing and heat absorbing effect.
Inventors
- 👤 Gerhard Thien
- 👤 Heinz Fachbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:40
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/11; F02B77/13; F02B2275/00; F02B2275/34; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A sound-proofed internal combustion engine comprising a sound-proofing casing arranged around the engine in spaced relation to same, a cooling-air blower driven by the internal combustion engine and arranged inside said casing, at least one inlet and one outlet in said casing provided for the passage of the cooling air delivered by said blower, an exhaust pipe extending through said casing, a sleeve mounted on said casing in the area of the point at which the exhaust pipe traverses said casing, said sleeve being formed as a muffler surrounding said exhaust pipe in spaced relation to same and defining an annular clearance together with the exhaust pipe, said annular clearance forming an outlet for the cooling air delivered by said blower, and a corrugated tube located in said exhaust pipe between the point where said exhaust pipe is attached to the engine and the point where said exhaust pipe traverses said casing, said corrugated tube forming a sound-insulating intermediate piece for said exhaust pipe.
Claim 2
Dependent Claim
164 words
A sound-proofed internal combustion engine comprising a sound-proofing casing arranged around the engine in spaced relation to same, a cooling-air blower driven by the internal combustion engine and arranged inside said casing, at least one inlet and one outlet in said casing provided for the passage of the cooling air delivered by said blower, an exhaust pipe extending through said casing, a sleeve mounted on said casing in the area of the point at which the exhaust pipe traverses said casing, said sleeve being formed as a muffler surrounding said exhaust pipe in spaced relation to same and defining an annular clearance together with the exhaust pipe, said annular clearance forming an outlet for the cooling air delivered by said blower, and a corrugated tube located in said exhaust pipe between the point where said exhaust pipe is attached to the engine and the point where said exhaust pipe traverses said casing, said corrugated tube forming a sound-insulating intermediate piece for said exhaust pipe.
Claim 3
Dependent Claim
22 words
An internal combustion engine according to claim 1 wherein said muffler is in the shape of a tube surrounding said exhaust pipe.
Claim 4
Dependent Claim
70 words
An internal combustion engine according to claim 1, further comprising a cylinder-head traversed by cooling-water, a housing on said cylinder head, a cooling-water chamber located inside said housing and connected to a water-carrying chamber of said cylinder head, said exhaust pipe extending through said housing inside said cooling water chamber, and a cooling-water return pipe emerging from said housing and extending through said casing in the area of said housing.
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |