US5357972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable pneumotachograph flowmeter
Assignee: Wells Fargo Bank Minnesota NA
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Filing: 1993-05-17
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Granted: 1994-10-25
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Expires: 2013-05-17
Abstract
Abstract A disposable pneumotachograph flowmeter comprises first and second tubular mouthpiece members which, when juxtaposed relative to one another, sandwich a fabric screen made from a hydrophobic material therebetween. The screen may comprise a woven fabric formed from expanded PTFE fibers or, alternatively, may be a non-woven mat of polyester fibers. Because of the properties of the screen material, it does not become clogged and occluded with moisture particles during use.
Inventors
- 👤 John A. Norlien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:35
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/097; A61B5/087
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A pneumotachograph flowmeter comprising: (a) a tubular mouthpiece member having a lumen extending the length thereof; (b) a fabric screen of expanded, PTFE fibers extending transverse to said lumen and having a multiplicity of pores, the size providing a predetermined resistance to fluid flow therethrough with the flow being laminar through said lumen; and (c) pressure sensing ports in said mouthpiece member disposed on opposite sides of said screen.
Claim 2
Dependent Claim
69 words
A pneumotachograph flowmeter comprising: (a) a tubular mouthpiece member having a lumen extending the length thereof; (b) a fabric screen of expanded, PTFE fibers extending transverse to said lumen and having a multiplicity of pores, the size providing a predetermined resistance to fluid flow therethrough with the flow being laminar through said lumen; and (c) pressure sensing ports in said mouthpiece member disposed on opposite sides of said screen.
Claim 3
Dependent Claim
23 words
The pneumotachograph flow member as in claim 1 wherein said pores are of a size on the order of 2.25×10 -6 square inches.
Claim 4
Dependent Claim
150 words
The pneumotachograph flowmeter as in claim 1 wherein said tubular mouthpiece member comprises: (a) a first piece having a tubular segment with a first cross-sectional area and a second tubular segment having first and second ends, said first end being integrally joined to said first segment and said second end having a second cross-sectional area greater than said first cross-sectional area; (b) a second piece having a tubular segment with a first cross-sectional area and second tubular segment having first and second ends, said first end being joined to said first segment and said second end having a second cross-sectional area equal to said second cross-sectional area of said second end of said first piece; and (c) said fabric screen being in covering relation to said second ends of said first and second pieces when said second ends of said first and second pieces are juxtaposed across said fabric screen.
Claim 5
Dependent Claim
30 words
The pneumotachograph flowmeter as in claim 3 wherein said pressure sensing ports are formed through a wall surface of said first and second pieces proximate said second ends of each.
Claim 6
Dependent Claim
79 words
A pneumotachograph flowmeter comprising: (a) a tubular mouthpiece member having a lumen extending the length thereof; (b) a fabric screen of a non-woven polyester fiber material having randomly located pores extending therethrough, with the average size of said pores being about 2.225×10 -6 square inches so as to offer a predetermined resistance to fluid flow with the flow being laminar through said lumen, and (c) pressure sensing ports in said mouthpiece member disposed on opposite sides of said screen.
Claim 7
Dependent Claim
79 words
A pneumotachograph flowmeter comprising: (a) a tubular mouthpiece member having a lumen extending the length thereof; (b) a fabric screen of a non-woven polyester fiber material having randomly located pores extending therethrough, with the average size of said pores being about 2.225×10 -6 square inches so as to offer a predetermined resistance to fluid flow with the flow being laminar through said lumen, and (c) pressure sensing ports in said mouthpiece member disposed on opposite sides of said screen.
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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) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |