Patent US4749385A successfully refreshed from Google Patents.
US4749385A
Expired / Lapsed
US
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Method and apparatus for providing clean air
Assignee: RCA Licensing Corp
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Filing: 1987-03-27
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Granted: 1988-06-07
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Expires: 2007-03-27
Abstract
Abstract A method of providing clean air to a workpiece comprises positioning the workpiece adjacent to a first opening in a conduit. The conduit includes a central segment and a peripheral segment having, respectively, the first opening and a second opening disposed at opposite ends of the conduit. The peripheral segment surrounds the central segment such that the first opening is substantially coplanar with the second opening. A laminar flow of air is created through the conduit in a direction away from the second opening and toward the first opening. The air flow is filtered through a HEPA filter supported within the conduit.
Inventors
- 👤 Glenn W. Brunner
- 👤 Samuel Pearlman
- 👤 Randall E. McCoy
- 👤 Jordan R. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:22
CPC Classifications
F; F24; F24F; F24F8/00; F24F8/80; B; B01; B01D; B01D46/00; B01D46/10; F24F8/10; F24F8/108; F24F2221/00; F24F2221/12; Y; Y10; Y10S; Y10S55/00; Y10S55/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A method of providing clean air to a workpiece comprising the steps of: positioning said workpiece adjacent to a first opening in a conduit including a central segment and a peripheral segment having, respectively, said first opening and a second opening disposed at opposite ends of said conduit, such that said first opening is substantially coplanar with said second opening, the dimensions of said first opening being similar to that of said workpiece; creating a laminar flow of air through said conduit in a direction away from said second opening and toward said first opening; and filtering said air flow.
Claim 2
Independent Claim
100 words
A method of providing clean air to a workpiece comprising the steps of: positioning said workpiece adjacent to a first opening in a conduit including a central segment and a peripheral segment having, respectively, said first opening and a second opening disposed at opposite ends of said conduit, such that said first opening is substantially coplanar with said second opening, the dimensions of said first opening being similar to that of said workpiece; creating a laminar flow of air through said conduit in a direction away from said second opening and toward said first opening; and filtering said air flow.
Claim 3
Dependent Claim
79 words
A method as recited in claim 1 wherein said conduit comprises a first boxlike structure having said first opening at one end thereof and a connecting opening at the end opposite said one end to form said central segment, said first structure being disposed within a second boxlike structure, larger than said first structure and open at one end thereof, to form said peripheral segment such that said peripheral segment communicates with said central segment through said connecting opening.
Claim 4
Dependent Claim
30 words
A method as recited in claim 2 wherein said laminar flow creating step is performed by operating a fan supported by said first boxlike structure adjacent to said connecting opening.
Claim 5
Dependent Claim
26 words
A method as recited in claim 2 wherein said filtering step is performed by placing a High-Efficiency Processed Air (HEPA) filter within said first boxlike structure.
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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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |