US4722203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stitch-bonded fabrics for reinforcing coated abrasive backings
Assignee: Saint Gobain Abrasives Inc
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Filing: 1986-04-24
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Granted: 1988-02-02
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Expires: 2006-04-24
Abstract
Abstract Stitch bonded fabrics were found to be suitable substrates for coated abrasives when the fabric has a strength in the warp direction of at least 30 dekanewtons (daN) per centimeter (cm) of width, a fill yarn cover factor of at least 40%, and stitch yarns with a tensile strength of at least 0.5 daN. For substitution of the established commercial classes of abrasives known as X and Y weights, the fabrics are preferably made on a Malimo machine, with 14-22 warp yarns of 840-1300 denier high tenacity multifilament polyester or glass per 25 cm of fabric width, at least 64 fill yarns of staple or texturized multifilament polyester per 25 cm of fabric length, and stitch yarns of 70-140 denier high tenacity multifilament polyester.
Inventors
- 👤 Dhiraj H. Darjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:25
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/10; D04B; D04B21/00; D04B21/14; D04B21/16; D04B21/165; D10; D10B; D10B2403/00; D10B2403/02; D10B2403/024; D10B2403/0241; D10B2403/02412; D10B2505/00; D10B2505/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
117 words
A reinforcing substrate for coated abrasive backings comprising a stitch bonded fabric, wherein said fabric comprises: (a) an array of straight warp yarns having an array tensile strength of at least 30 dekanewtons per centimeter of fabric width; (b) an array of straight fill yarns disposed on one side of said array of warp yarns and having a cover factor of at least 40%; and (c) a plurality of stitch yarns, each such yarn having a tensile breaking strength of at least 0.5 dekanewtons, formed in loops around groupsof individual yarn members of said arrays of straight warp yarns and of straight fill yarns, whereby the two said arrays of yarns are bonded into a coherent fabric.
Claim 2
Dependent Claim
117 words
A reinforcing substrate for coated abrasive backings comprising a stitch bonded fabric, wherein said fabric comprises: (a) an array of straight warp yarns having an array tensile strength of at least 30 dekanewtons per centimeter of fabric width; (b) an array of straight fill yarns disposed on one side of said array of warp yarns and having a cover factor of at least 40%; and (c) a plurality of stitch yarns, each such yarn having a tensile breaking strength of at least 0.5 dekanewtons, formed in loops around groupsof individual yarn members of said arrays of straight warp yarns and of straight fill yarns, whereby the two said arrays of yarns are bonded into a coherent fabric.
Claim 3
Dependent Claim
23 words
A fabric according to claim 1, wherein the number of stitch yarns is at least as great as the number of warp yarns.
Claim 4
Dependent Claim
33 words
A fabric according to claim 2, wherein said array of straight warp yarns consists of substantially uniformly spaced yarns in a number not greater than one per millimeter of width of said array.
Claim 5
Dependent Claim
23 words
A fabric according to claim 3, wherein said array of straight fill yarns comprises more than 25 yarns per centimeter of fabric length.
Claim 6
Dependent Claim
23 words
A fabric according to claim 2, wherein said array of straight fill yarns comprises more than 25 yarns per centimeter of fabric length.
Claim 7
Dependent Claim
23 words
A fabric according to claim 1, wherein said array of straight fill yarns comprises more than 25 yarns per centimeter of fabric length.
Claim 8
Dependent Claim
31 words
A fabric according to claim 6, wherein at least half the volume of said stitch yarns consists of fibers having a tensile breaking strength of at least 0.007 dekanewtons per denier.
Claim 9
Dependent Claim
31 words
A fabric according to claim 5, wherein at least half the volume of said stitch yarns consists of fibers having a tensile breaking strength of at least 0.007 dekanenewtons per denier.
Claim 10
Dependent Claim
31 words
A fabric according to claim 4, wherein at least half the volume of said stitch yarns consists of fibers having a tensile breaking strength of at least 0.007 dekanewtons per denier.
Claim 11
Dependent Claim
31 words
A fabric according to claim 3, wherein at least half the volume of said stitch yarns consists of fibers having a tensile breaking strength of at least 0.007 dekanewtons per denier.
Claim 12
Dependent Claim
31 words
A fabric according to claim 2, wherein at least half the volume of said stitch yarns consists of fibers having a tensile breaking strength of at least 0.007 dekanewtons per denier.
Claim 13
Dependent Claim
31 words
A fabric according to claim 1, wherein at least half the volume of said stitch yarns consists of fibers having a tensile breaking strength of at least 0.007 dekanewtons per denier.
Claim 14
Dependent Claim
28 words
A fabric according to claim 4, wherein said array of straight fill yarns comprises to the extent of at least half its volume yarns of texturized filament polyester.
Claim 15
Dependent Claim
38 words
A fabric according to claim 13, wherein at least half the volume of the yarns of said array of straight warp yarns consists of multifilament polyester yarns having a breaking strength of at least 8 grams per denier.
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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) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |