US4924872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular pressure transducer
Assignee: Smiths Medical ASD Inc
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Filing: 1989-04-24
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Granted: 1990-05-15
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Expires: 2009-04-24
Abstract
Abstract In a blood pressure monitoring system, a transducer which is a conductive rubber tube having conductive terminals at each end, and circumferentially spaced conductors connected to said semi-conductive band, whereby fluid under varying pressure will cause said insulative tube to expand and contract, thereby causing said semi-conductive band to expand and contract, thereby varying the resistance of the semi-conductive band.
Inventors
- 👤 Thomas P. Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:54
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; A61M; A61M39/00; A61M39/08; A61M2205/00; A61M2205/02; A61M2205/0227; A61M2205/0233; A61M2205/0272; A61M2205/0294; A61M2205/33; A61M2205/3331
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A fluid pressure transducer comprising, a resilient insulative tube, a semi-conductive stripe deposited on said tube, and conductors connected to said stripe, said combination of resilient tube and stripe creating a sensor that varies in resistance upon expansion and contraction of the stripe when the insulative tube expands and contracts under varying pressure.
Claim 2
Dependent Claim
53 words
A fluid pressure transducer comprising, a resilient insulative tube, a semi-conductive stripe deposited on said tube, and conductors connected to said stripe, said combination of resilient tube and stripe creating a sensor that varies in resistance upon expansion and contraction of the stripe when the insulative tube expands and contracts under varying pressure.
Claim 3
Dependent Claim
73 words
A fluid pressure transducer comprising, a resilient insulative tube, ions implanted in the surface of at least a portion of said tube to create a semi-conductive portion of said tube, and conductors connected to the semi-conductive portion of said tube, said combination of resilient tube and semi-conductive portion creating a sensor that varies in resistance upon expansion and contraction of the semi-conductive portion when the insulative tube expands and contracts under varying pressure.
Claim 4
Dependent Claim
73 words
A fluid pressure transducer comprising, a resilient insulative tube, ions implanted in the surface of at least a portion of said tube to create a semi-conductive portion of said tube, and conductors connected to the semi-conductive portion of said tube, said combination of resilient tube and semi-conductive portion creating a sensor that varies in resistance upon expansion and contraction of the semi-conductive portion when the insulative tube expands and contracts under varying pressure.
Claim 5
Dependent Claim
61 words
A fluid pressure transducer comprising, a resilient insulative tubing, a semi-conductive band deposited on and partially surrounding a section of tubing, and circumferentially spaced conductors connected to said semi-conductive band, said combination of resilient tubing and band creating a sensor that varies in resistance upon expansion and contraction of the band when the insulative tubing expands and contracts under varying pressure.
Claim 6
Dependent Claim
61 words
A fluid pressure transducer comprising, a resilient insulative tubing, a semi-conductive band deposited on and partially surrounding a section of tubing, and circumferentially spaced conductors connected to said semi-conductive band, said combination of resilient tubing and band creating a sensor that varies in resistance upon expansion and contraction of the band when the insulative tubing expands and contracts under varying pressure.
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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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |