US4284507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knit pile filter
Assignee: Individual
•
Filing: 1979-05-09
•
Granted: 1981-08-18
•
Expires: 1999-05-09
Abstract
Abstract A filter, and apparatus and methods using the filter, in the form of a knitted fabric having particular characteristics and effective for separating materials from flowing fluid streams.
Inventors
- 👤 Frank T. Beane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:52
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B30; B30B; B30B9/00; B30B9/02; B30B9/26; B30B9/265; D; D04; D04B; D04B1/00; D04B1/02; B01D2201/00; B01D2201/50; B01D2239/00; B01D2239/12; B01D2239/1233; Y; Y10; Y10S; Y10S55/00; Y10S55/43
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
86 words
A method of making fabric filter bags comprising 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.
Claim 2
Independent Claim
86 words
A method of making fabric filter bags comprising 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.
Claim 3
Dependent Claim
40 words
A method according to claim 1 wherein the step of knitting comprises forming the yarn into stitches defining terry loop pile extending from the ground to a height in the range of from about 0.5 mm to about 4 mm.
Claim 4
Dependent Claim
31 words
A method according to claim 1 wherein the step of knitting comprises forming the yarn into stitches and into courses having from about 8 stitches to about 13 stitches per centimeter.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein the step of sewing comprises closing one end of the tube.
Claim 6
Dependent Claim
44 words
A method according to claim 1 wherein the step of sewing comprises slitting the tube and opening the fabric into a flat web, and then sewing the flat web fabric into a closed end tube of predetermined diameter and at least a predetermined length.
Claim 7
Dependent Claim
72 words
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, and the tube being closed at one end.
Claim 8
Dependent Claim
72 words
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, and the tube being closed at one end.
Claim 9
Dependent Claim
34 words
A fabric filter bag according to claim 6 wherein the stitches define terry loop pile extending from the ground to a height in the range of from about 0.5 mm to about 4 mm.
Claim 10
Dependent Claim
25 words
A fabric filter bag according to claim 6 wherein the stitches are formed in courses having from about 8 to about 13 stitches per centimeter.
Claim 11
Dependent Claim
17 words
A fabric filter bag according to claim 6 wherein the tube is seamless along the length thereof.
Claim 12
Dependent Claim
18 words
A fabric filter bag according to claim 6 wherein the tube is longitudinally seamed along the length thereof.
Claim 13
Dependent Claim
117 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 improvement wherein said bag comprises 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, and the tube being closed at one end.
Claim 14
Dependent Claim
117 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 improvement wherein said bag comprises 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, and the tube being closed at one end.
Claim 15
Dependent Claim
32 words
An apparatus according to claim 11 wherein the stitches define terry loop pile extending from the ground to a height in the range of from about 0.5 mm to about 4 mm.
Claim 16
Dependent Claim
23 words
An apparatus according to claim 11 wherein the stitches are formed in courses having from about 8 to about 13 stitches per centimeter.
Claim 17
Dependent Claim
15 words
An apparatus according to claim 11 wherein the tube is seamless along the length thereof.
Claim 18
Dependent Claim
16 words
An apparatus according to claim 11 wherein the tube is longitudinally seamed along the length thereof.
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |