US4322232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter bag and method for suppressing electrostatic charges
Assignee: BEANE FILTER MEDIA INC A CORP OF
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Filing: 1980-10-30
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Granted: 1982-03-30
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Expires: 2000-10-30
Abstract
Abstract A fabric filter bag, a method of making such a bag, and apparatus using such bags, in which the bag is a tube of yarn knit into stitches defining a ground and stitches defining terry loop pile extending from the ground. In accordance with the present invention, such a fabric filter bag, method of making a bag, and apparatus using a bag is improved by the inclusion of a conductive strand for conducting electrostatic charges otherwise accumulating on the fabric filter bag away from the bag so as to suppress accumulation or build-up of such charges.
Inventors
- 👤 Thomas F. Beane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:37
CPC Classifications
D; D04; D04B; D04B1/00; D04B1/02; D04B1/04; B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D39/086; B01D46/00; B01D46/02; B30; B30B; B30B9/00; B30B9/02; B30B9/26; B30B9/265; B01D2201/00; B01D2201/50; B01D2239/00; B01D2239/02; B01D2239/0241; B01D2239/12; B01D2239/1233; D10; D10B; D10B2401/00; D10B2401/16; D10B2505/00; D10B2505/04; Y; Y10; Y10S; Y10S55/00; Y10S55/43; Y10S55/44
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
121 words
In a method of making fabric filter bags which includes circularly knitting crimped, synthetic yarn having a denier in the range of from about 70 to about 300 into a tube of predetermined diameter and at least a predetermined length while forming the yarn into stitches defining a ground and stitches defining terry loop pile extending from the ground to a predetermined height, the stitches defining open areas in the range of from about 1 micron to about 100 microns, and then sewing the fabric into a bag, an improvement which facilitates safely discharging electrostatic charges otherwise accumulating on the fabric filter bags during filtration use, the improvement comprising the step of knitting with the filamentary yarn an electrically conductive strand.
Claim 2
Dependent Claim
121 words
In a method of making fabric filter bags which includes circularly knitting crimped, synthetic yarn having a denier in the range of from about 70 to about 300 into a tube of predetermined diameter and at least a predetermined length while forming the yarn into stitches defining a ground and stitches defining terry loop pile extending from the ground to a predetermined height, the stitches defining open areas in the range of from about 1 micron to about 100 microns, and then sewing the fabric into a bag, an improvement which facilitates safely discharging electrostatic charges otherwise accumulating on the fabric filter bags during filtration use, the improvement comprising the step of knitting with the filamentary yarn an electrically conductive strand.
Claim 3
Dependent Claim
38 words
A method according to claim 1 wherein the step of knitting an electrically conductive strand comprises feeding the electrically conductive strand with a yarn while forming the strand and the yarn into the stitches defining terry loop pile.
Claim 4
Independent Claim
24 words
A method according to one of claims 1 and 2 wherein the electrically conductive strand comprises a synthetic monofilament strand having electrically conductive characteristics.
Claim 5
Independent Claim
20 words
A method according to one of claims 1 and 2 wherein the electrically conductive strand comprises a metallic staple strand.
Claim 6
Dependent Claim
110 words
In a fabric filter bag comprising a tube of circularly knitted, crimped, synthetic yarn having a denier in the range of from about 70 to about 300 and knit into stitches defining a ground and stitches defining terry loop pile extending from the ground to a predetermined height, the stitches defining open areas in the range of from about 1 micron to about 100 microns, the tube being closed at one end, an improvement which facilitates safely discharging electrostatic charges otherwise accumulating on the fabric filter bag during filtration use, the improvement comprising an electrically conductive strand knitted with the yarn for conducting electrostatic charges from the fabric filter bag.
Claim 7
Dependent Claim
110 words
In a fabric filter bag comprising a tube of circularly knitted, crimped, synthetic yarn having a denier in the range of from about 70 to about 300 and knit into stitches defining a ground and stitches defining terry loop pile extending from the ground to a predetermined height, the stitches defining open areas in the range of from about 1 micron to about 100 microns, the tube being closed at one end, an improvement which facilitates safely discharging electrostatic charges otherwise accumulating on the fabric filter bag during filtration use, the improvement comprising an electrically conductive strand knitted with the yarn for conducting electrostatic charges from the fabric filter bag.
Claim 8
Dependent Claim
25 words
A fabric filter bag according to claim 5, wherein the electrically conductive strand is knitted with a yarn into the stitches defining terry loop pile.
Claim 9
Dependent Claim
26 words
A fabric filter bag according to one of claims 5 and 6 wherein the electrically conductive strand is a synthetic monofilament strand having electrically conductive characteristics.
Claim 10
Dependent Claim
22 words
A fabric filter bag according to one of claims 5 and 6 wherein the electrically conductive strand is a metallic staple strand.
Claim 11
Dependent Claim
152 words
In a bag filter apparatus having a fabric bag for filtering material from flowing fluid, housing means for enclosing and supporting said bag, and circulating means including inlet and outlet means for directing a flow of fluid through said housing means and said bag, the bag comprising a tube of circularly knitted, crimped, synthetic yarn having a denier in the range of from about 70 to about 300 and knit into stitches defining a ground and stitches defining terry loop pile extending from the ground to a predetermined height, the stitches defining open areas in the range of from about 1 micron to about 100 microns the tube being closed at one end, an improvement which facilitates safely discharging electrostatic charges otherwise accumulating on the fabric filter bag during filtration use, the improvement comprising an electrically conductive strand knitted with the yarn for conducting from the bag electrostatic charges otherwise accumulating thereon.
Claim 12
Dependent Claim
152 words
In a bag filter apparatus having a fabric bag for filtering material from flowing fluid, housing means for enclosing and supporting said bag, and circulating means including inlet and outlet means for directing a flow of fluid through said housing means and said bag, the bag comprising a tube of circularly knitted, crimped, synthetic yarn having a denier in the range of from about 70 to about 300 and knit into stitches defining a ground and stitches defining terry loop pile extending from the ground to a predetermined height, the stitches defining open areas in the range of from about 1 micron to about 100 microns the tube being closed at one end, an improvement which facilitates safely discharging electrostatic charges otherwise accumulating on the fabric filter bag during filtration use, the improvement comprising an electrically conductive strand knitted with the yarn for conducting from the bag electrostatic charges otherwise accumulating thereon.
Claim 13
Dependent Claim
23 words
An apparatus according to claim 9 wherein the electrically conductive strand is knitted with a yarn into the stitches defining terry loop pile.
Claim 14
Independent Claim
24 words
An apparatus according to one of claims 9 and 10 wherein the electrically conductive strand is a synthetic monofilament strand having electrically conductive characteristics.
Claim 15
Independent Claim
20 words
An apparatus according to one of claims 9 and 10 wherein the electrically conductive strand is a metallic staple strand.
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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) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |