Patent US4023472A successfully refreshed from Google Patents.
US4023472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing a laminar flow
Assignee: Novartis Corp
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Filing: 1975-05-27
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Granted: 1977-05-17
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Expires: 1995-05-27
Abstract
Abstract A laminar flow producing means is described having a blower which passes air to a distributor having a buffer zone with a ratio between its volume and cross-sectional area A being smaller than 1/2√A and two mesh screens spaced about 0.2 to 5 cm apart and each having mesh openings measuring about 0.001 to 1mm so that the air from the blower is passed through the screen meshes seriatim to produce a clean, dust-free laminar flow of air.
Inventors
- 👤 Hans Grunder
- 👤 Walter Setz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:39
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/068; F24F7/00; F24F7/04; F24F7/06; F24F7/10; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
194 words
An apparatus for producing a displacement flow substantially free from turbulence, comprising a blower having an exhaust; at least one air distributor comprising an open frame-like housing which is provided with an inlet and with an open side which constitutes an outlet; conduit means connecting the exhaust of said blower to the inlet of said air distributor; a steadying means positioned within said housing between the inlet and the outlet and extending across the outlet so that air traveling from the inlet to the outlet passes through said steadying means, the steadying means comprising at least two parallel, spaced apart mesh screens extending across the outlet and having mesh openings of from about 0.005 to 1.0 mm with the spacing between any two adjacent mesh screens being from about 0.2 to 5 cm; and a buffer zone within said housing upstream of said steadying means and defined by that portion of the housing between the first mesh screen encountered by the air flow and said inlet, the ratio between the volume of the buffer zone and its cross-sectional area parallel to the outlet being smaller than 1/2√ A, wherein A denotes said cross-sectional area.
Claim 2
Independent Claim
194 words
An apparatus for producing a displacement flow substantially free from turbulence, comprising a blower having an exhaust; at least one air distributor comprising an open frame-like housing which is provided with an inlet and with an open side which constitutes an outlet; conduit means connecting the exhaust of said blower to the inlet of said air distributor; a steadying means positioned within said housing between the inlet and the outlet and extending across the outlet so that air traveling from the inlet to the outlet passes through said steadying means, the steadying means comprising at least two parallel, spaced apart mesh screens extending across the outlet and having mesh openings of from about 0.005 to 1.0 mm with the spacing between any two adjacent mesh screens being from about 0.2 to 5 cm; and a buffer zone within said housing upstream of said steadying means and defined by that portion of the housing between the first mesh screen encountered by the air flow and said inlet, the ratio between the volume of the buffer zone and its cross-sectional area parallel to the outlet being smaller than 1/2√ A, wherein A denotes said cross-sectional area.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1, wherein the steadying means consists solely of said mesh screens.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1, wherein the ratio between volume and cross-sectional area of the buffer zone is smaller than 1/6√A.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1, wherein the mesh openings are from about 0.08 to 0.1 mm.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1, wherein the mesh openings of each of the screens comprising said steadying means are substantially identical.
Claim 7
Dependent Claim
168 words
An air distributor for producing a displacement flow substantially free from turbulence, comprising a frame-like housing with an air inlet and an air outlet constituted by an open side of the housing; a steadying means positioned within said housing between the inlet and the outlet and extending across the outlet so that air travelling from the inlet to the outlet passes through said steadying means, the steadying means comprising at least two parallel, spaced apart mesh screens extending across the outlet and having mesh openings of from about 0.005 to 1.0 mm with the spacing between any two adjacent mesh screens being from about 0.2 to 5 cm; and a buffer zone within said housing upstream of said steadying means and defined by that portion of the housing between the first mesh screen encountered by the air flow and said inlet, the ratio between the volume of the buffer zone and its cross-sectional area parallel to the outlet being smaller than 1/2√A, wherein A denotes said cross-sectional area.
Claim 8
Dependent Claim
168 words
An air distributor for producing a displacement flow substantially free from turbulence, comprising a frame-like housing with an air inlet and an air outlet constituted by an open side of the housing; a steadying means positioned within said housing between the inlet and the outlet and extending across the outlet so that air travelling from the inlet to the outlet passes through said steadying means, the steadying means comprising at least two parallel, spaced apart mesh screens extending across the outlet and having mesh openings of from about 0.005 to 1.0 mm with the spacing between any two adjacent mesh screens being from about 0.2 to 5 cm; and a buffer zone within said housing upstream of said steadying means and defined by that portion of the housing between the first mesh screen encountered by the air flow and said inlet, the ratio between the volume of the buffer zone and its cross-sectional area parallel to the outlet being smaller than 1/2√A, wherein A denotes said cross-sectional area.
Claim 9
Dependent Claim
16 words
The air distributor of claim 6, wherein the steadying means consists solely of said mesh screens.
Claim 10
Dependent Claim
22 words
The air distributor of claim 6, wherein the ratio between volume and cross-sectional area of the buffer zone is smaller than 1/6√A.
Claim 11
Dependent Claim
17 words
The air distributor of claim 6, wherein the mesh openings are from about 0.08 to 0.1 mm.
Claim 12
Dependent Claim
22 words
The air distributor of claim 6, wherein the mesh openings of each of the screens comprising said steadying means are substantially identical.
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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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |