Patent US3779341A successfully refreshed from Google Patents.
US3779341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppressive fan shroud
Assignee: Modine Manufacturing Co
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Filing: 1972-10-16
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Granted: 1973-12-18
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Expires: 1992-10-16
Abstract
Abstract A noise suppressive fan structure and a heat exchanger having on one side thereof the fan structure in which the fan structure comprises a fan having blades rotatable about an axis and shrouds adjacent the fan comprising closely spaced sound absorbing baffles that are curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan. Where the fan structure is used in conjunction with an air permeable heat exchanger the shroud may be on the side of the fan opposite the heat exchanger.
Inventors
- 👤 H Huggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:49
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/10; F01P; F01P5/00; F01P5/02; F01P5/06; F04; F04D; F04D29/00; F04D29/66; F04D29/661; F04D29/663
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
A heat exchanger structure, comprising: an air permeable heat exchanger; a fan on one side of said heat exchanger having blades rotatable about an axis; shrouds on the opposite sides of said fan each comprising circularly closely spaced baffles substantially coaxial with said fan axis and each comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said fan axis.
Claim 2
Dependent Claim
126 words
A heat exchanger structure, comprising: an air permeable heat exchanger; a fan on one side of said heat exchanger having blades rotatable about an axis; shrouds on the opposite sides of said fan each comprising circularly closely spaced baffles substantially coaxial with said fan axis and each comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said fan axis.
Claim 3
Dependent Claim
135 words
A heat exchanger structure, comprising: an air permeable finned heat exchanger also functioning as a sound absorbing shroud; a fan on one side of said heat exchanger having blades rotatable about an axis; a shroud on the side of said fan opposite the heat exchanger comprising circularly closely spaced baffles substantially coaxial with said fan axis comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said fan axis.
Claim 4
Dependent Claim
135 words
A heat exchanger structure, comprising: an air permeable finned heat exchanger also functioning as a sound absorbing shroud; a fan on one side of said heat exchanger having blades rotatable about an axis; a shroud on the side of said fan opposite the heat exchanger comprising circularly closely spaced baffles substantially coaxial with said fan axis comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said fan axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |