US Patent No: 6,520,747
Number of patents in Portfolio can not be more than 2000
System for measuring change in fluid flow rate within a line
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Feb 18, 2003
Issued date -
Feb 4, 2002
filing date -
10/067,661
serial no -
In Force
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Abstract
A method and system for determining change in a fluid's flow rate within a line. The pressure variation in a second fluid, separated from the first by a pumping membrane, is measured in response to energy applied in a time-varying manner to the second fluid. From the response of the second fluid to the applied energy, changes in the flow rate of the first fluid are determined.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,325,884 Compressed air control system | 33 | 1991 | |
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| 5,069,792 Adaptive filter flow control system and method | 48 | 1990 | |
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| 5,463,228 Apparatus for the detection of a fluid phase boundary in a transparent measuring tube and for the automatic exact metering of an amount of liquid | 21 | 1993 | |
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| 6,065,941 System for measuring when fluid has stopped flowing within a line | 43 | 1999 | |
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| 5,355,890 Pulse signal extraction apparatus for an automatic blood pressure gauge | 24 | 1994 | |
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| 5,579,244 Pressure controller | 21 | 1995 | |
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| 5,146,414 Method and apparatus for continuously measuring volumetric flow | 65 | 1990 | |
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| 4,855,714 Fluid status detector | 19 | 1987 | |
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| 5,051,922 Method and apparatus for the measurement of gas/liquid flow | 49 | 1989 | |
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| 5,255,072 Apparatus for analyzing fluid by multi-fluid modulation mode | 18 | 1992 | |
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| 4,431,425 Flow fault sensing system | 41 | 1981 | |
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| 4,662,540 Apparatus for dispensing medium to high viscosity liquids with liquid flow detector and alarm | 37 | 1984 | |
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| 5,272,646 Method for locating leaks in a fluid pipeline and apparatus therefore | 55 | 1991 | |
| 5,428,527 Method and device for the consideration of varying volume and flow in the control of a continuous flow process | 15 | 1992 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Aug 18, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |