US4400971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for measuring particulate matter on a filter
Assignee: Electric Power Research Institute
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Filing: 1981-05-29
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Granted: 1983-08-30
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Expires: 2001-05-29
Abstract
Abstract The amount of particulate matter deposited on a fabric filter during operating conditions is determined by capacitive measurements. The fabric filter material is mounted on a first perforated electrode and a second electrode is spaced from the first electrode and capacitively associated therewith. Capacitance between the electrodes varies with the amount of particulate matter on the filter. Bridge circuitry is employed to determine the capacitance between the electrodes.
Inventors
- 👤 Owen J. Tassicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:21
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0013; B01D46/66; B01D46/785; B01D46/0084; B01D46/0086; B01D46/24; G; G01; G01D; G01D21/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A method of determining the amount of particulate matter on a fabric filter comprising the steps of providing a first electrode on which said fabric filter is mounted, providing a second electrode in association with one end of said first electrode, providing a second electrode in association with another end of said first electrode, and providing a plurality of fourth electrodes between said second and third electrodes and in association with said first electrode, and determining the capacitance between said first electrode and said plurality of fourth electrodes.
Claim 2
Independent Claim
88 words
A method of determining the amount of particulate matter on a fabric filter comprising the steps of providing a first electrode on which said fabric filter is mounted, providing a second electrode in association with one end of said first electrode, providing a second electrode in association with another end of said first electrode, and providing a plurality of fourth electrodes between said second and third electrodes and in association with said first electrode, and determining the capacitance between said first electrode and said plurality of fourth electrodes.
Claim 3
Dependent Claim
39 words
The method of determining the amount of particulate matter on a fabric filter as defined by claim 1 wherein said step of providing first electrode includes providing a plurality of first electrodes on which said fabric filter is mounted.
Claim 4
Dependent Claim
45 words
The method of determining the amount of particulate matter on a fabric filter as defined by claim 1 wherein said step of determining capacitance comprises the steps of connecting said first electrode and said fourth electrode in bridge circuitry and capacitively balancing said bridge circuitry.
Claim 5
Dependent Claim
83 words
A fabric filter module for removing particulate matter in a gaseous fluid and which allows the determination of the amount of particulate matter deposited on said filter under operating conditions comprising a first conductive means including a first perforated electrode and filter support, fabric filter material mounted on said first conductive means, second conductive means spaced from said first conductive means, and means electrically contacting said first and second conductive means whereby capacitance between said first and second conductive means can be determined.
Claim 6
Dependent Claim
83 words
A fabric filter module for removing particulate matter in a gaseous fluid and which allows the determination of the amount of particulate matter deposited on said filter under operating conditions comprising a first conductive means including a first perforated electrode and filter support, fabric filter material mounted on said first conductive means, second conductive means spaced from said first conductive means, and means electrically contacting said first and second conductive means whereby capacitance between said first and second conductive means can be determined.
Claim 7
Dependent Claim
55 words
The fabric filter module as defined by claim 4 wherein said second conductive means comprises a second electrode in association with one end of said first electrode, a third electrode in association with another end of said first electrode, and a fourth electrode between said second and third electrodes and associated with said first electrode.
Claim 8
Dependent Claim
33 words
The fabric filter module as defined by claim 5 wherein said fourth electrode comprises a plurality of electrodes whereby capacitance can be determined between each of said fourth electrodes and said first electrode.
Claim 9
Dependent Claim
44 words
The fabric filter module as defined by claim 4 wherein said first electrode includes a plurality of electrodes on which said fabric filter is mounted and said second conductive means comprises a second electrode spaced from and associated with each of said first electrodes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |