Patent US3510591A successfully refreshed from Google Patents.
US4152928A
Expired / Lapsed
US
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System for detecting fat particles in blood
Assignee: University Patents Inc
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Filing: 1977-05-02
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Granted: 1979-05-08
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Expires: 1997-05-02
Abstract
Abstract A system utilizing a bank of frequency staggered band-pass filters spanning the range in which fat emboli are known to occur is provided for the early detection of fat emboli in blood.
Inventors
- 👤 Richard A. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:57
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/032; A; A61; A61B; A61B8/00; A61B8/06; A61B8/48; A61B8/488; G01N2291/00; G01N2291/01; G01N2291/017; G01N2291/02; G01N2291/024; G01N2291/02416; G01N2291/10; G01N2291/101
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A system for producing signals indicative of the presence of fat particles in blood comprising, in combination: a doppler ultrasonic flowmeter for generating an electrical signal representative of blood flow characteristics; means responsive to said signal for detecting a peak of the power spectrum of said signal in relatively narrow frequency bands, having widths in the range between 50 and 120 Hz., over a relatively wide frequency range which includes a plurality of said narrow frequency bands; and means for recording said detected peak.
Claim 2
Independent Claim
84 words
A system for producing signals indicative of the presence of fat particles in blood comprising, in combination: a doppler ultrasonic flowmeter for generating an electrical signal representative of blood flow characteristics; means responsive to said signal for detecting a peak of the power spectrum of said signal in relatively narrow frequency bands, having widths in the range between 50 and 120 Hz., over a relatively wide frequency range which includes a plurality of said narrow frequency bands; and means for recording said detected peak.
Claim 3
Dependent Claim
22 words
The system as defined by claim 1 wherein said relatively wide frequency range is the range of about 300 to 800 Hz.
Claim 4
Independent Claim
88 words
A system for producing signals indicative of the presence of fat particles in blood comprising, in combination: a doppler ultrasonic flowmeter for generating an electrical signal representative of blood flow characteristics; means responsive to said signal for detecting a peak of the power spectrum of said signal in relatively narrow frequency bands over a relatively wide frequency range which includes a plurality of said narrow frequency bands, said relatively wide frequency range being the range of about 300 to 800 Hz.; and means for recording said detected peak.
Claim 5
Independent Claim
88 words
A system for producing signals indicative of the presence of fat particles in blood comprising, in combination: a doppler ultrasonic flowmeter for generating an electrical signal representative of blood flow characteristics; means responsive to said signal for detecting a peak of the power spectrum of said signal in relatively narrow frequency bands over a relatively wide frequency range which includes a plurality of said narrow frequency bands, said relatively wide frequency range being the range of about 300 to 800 Hz.; and means for recording said detected peak.
Claim 6
Independent Claim
74 words
A system for producing signals indicative of the presence of fat particles in blood comprising, in combination: a doppler ultrasonic flowmeter for generating an electrical signal representative of blood flow characteristics; means responsive to said signal for detecting a peak of the power spectrum of said signal in relatively narrow frequency bands over a relatively wide frequency range which includes a plurality of said narrow frequency bands; and means for recording said detected peak.
Claim 7
Independent Claim
74 words
A system for producing signals indicative of the presence of fat particles in blood comprising, in combination: a doppler ultrasonic flowmeter for generating an electrical signal representative of blood flow characteristics; means responsive to said signal for detecting a peak of the power spectrum of said signal in relatively narrow frequency bands over a relatively wide frequency range which includes a plurality of said narrow frequency bands; and means for recording said detected peak.
Claim 8
Dependent Claim
21 words
The system as defined by claim 4 wherein the filter bandpasses are in the range of 50 to 120 Hz wide.
Claim 9
Dependent Claim
22 words
The system as defined by claim 4 wherein the total range covered by the filter bandpasses is about 300 to 800 Hz.
Claim 10
Dependent Claim
22 words
The system as defined by claim 5 wherein the total range covered by the filter bandpasses is about 300 to 800 Hz.
Claim 11
Dependent Claim
36 words
The system as defined by claim 4 wherein said bank of parallel bandpass filters comprises five filters, each having a contiguous bandpass about 100 Hz wide in the total range of about 300 to 800 Hz.
Claim 12
Dependent Claim
24 words
The system as defined by claim 4 further comprising means for converting said signal to digital form, and wherein said filters are digital filters.
Claim 13
Dependent Claim
24 words
The system as defined by claim 5 further comprising means for converting said signal to digital form, and wherein said filters are digital filters.
Claim 14
Dependent Claim
24 words
The system as defined by claim 6 further comprising means for converting said signal to digital form, and wherein said filters are digital filters.
Claim 15
Dependent Claim
24 words
The system as defined by claim 7 further comprising means for converting said signal to digital form, and wherein said filters are digital filters.
Claim 16
Dependent Claim
24 words
The system as defined by claim 8 further comprising means for converting said signal to digital form, and wherein said filters are digital filters.
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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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |