US4672825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic cover
Assignee: Katsura Roller Manufacturing Co Ltd
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Filing: 1985-12-06
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Granted: 1987-06-16
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Expires: 2005-12-06
Abstract
Abstract An antistatic cover is composed of a tubular knitted fabric comprising water-shrinkable or heat-shrinkable ground yarns which are alternately knitted to form a needle loop in a course of a ground fabric so that each sinker loop of the ground fabric has a width longer than that of the needle loop, at least one of the ground yarns comprising charge control fibers or electrically conductive fibers. Pile yarns may be worked into each course of the ground fabric by alternately knitting together with a needle mesh of the ground fabric to form a needle loop. At least one of the ground yarns and pile yarns comprises charge control fibers or conductive fibers.
Inventors
- 👤 Akio Yasukawa
- 👤 Yoshihiro Misuna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
CPC Classifications
D; D04; D04B; D04B1/00; D04B1/02; D04B1/04; D10; D10B; D10B2401/00; D10B2401/02; D10B2401/04; D10B2401/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A tubular knitted fabric antistatic cover comprising two shrinkable ground yarns, said tubular knitted fabric having a tubular double plain knitted fabric structure wherein said two ground yarns are each alternatively knitted so that needle loops in each course of a ground fabric are alternately formed by said respective two ground yarns to form sinker loops each having a width longer than that of the corresponding needle loop in each said course of said ground fabric, and further wherein said ground yarns are selected from the group consisting of water-shrinkable yarns and heat-shrinkable yarns, at least one of said ground yarns containing fibers selected from the group consisting of charge control fibers and electrically conductive fibers, said tubular fabric having a radial shrinking percentage of generally between about 20 to 25% and an axial shrinking percentage of generally between about 25 to 30%.
Claim 2
Dependent Claim
143 words
A tubular knitted fabric antistatic cover comprising two shrinkable ground yarns, said tubular knitted fabric having a tubular double plain knitted fabric structure wherein said two ground yarns are each alternatively knitted so that needle loops in each course of a ground fabric are alternately formed by said respective two ground yarns to form sinker loops each having a width longer than that of the corresponding needle loop in each said course of said ground fabric, and further wherein said ground yarns are selected from the group consisting of water-shrinkable yarns and heat-shrinkable yarns, at least one of said ground yarns containing fibers selected from the group consisting of charge control fibers and electrically conductive fibers, said tubular fabric having a radial shrinking percentage of generally between about 20 to 25% and an axial shrinking percentage of generally between about 25 to 30%.
Claim 3
Dependent Claim
23 words
The antistatic cover of claim 1, wherein said ground yarn consists of nonacetalized polyvinyl alcoholic fibers, chemical fibers, reproduced fibers and natural fibers.
Claim 4
Dependent Claim
182 words
A tubular knitted fabric antistatic cover comprising two shrinkable ground yarns and two hydrophilic pile yarns, said tubular knitted fabric having a tubular double plain knitted fabric structure wherein said two ground yarns are each alternately knitted so that needle loops in each course of a ground fabric are alternately formed by said respective two ground yarns to form sinker loops each having a width longer than that of the corresponding needle loop in each said course of said ground fabric, and further wherein said ground yarns are selected from the group consisting of water-shrinkable and heat-shrinkable yarns, each of said pile yarns being worked into each course of said ground fabric and being alternately knitted together with a needle mesh of the respective ground fabrics to form raised loops, at least one of the ground yarns and pile yarns containing fibers selected from the group consisting of charge control fibers and electrically conductive fibers, said tubular fabric having a radial shrinking percentage of generally between about 20 to 25% and an axial shrinking percentage of generally between about 25 to 30%.
Claim 5
Dependent Claim
182 words
A tubular knitted fabric antistatic cover comprising two shrinkable ground yarns and two hydrophilic pile yarns, said tubular knitted fabric having a tubular double plain knitted fabric structure wherein said two ground yarns are each alternately knitted so that needle loops in each course of a ground fabric are alternately formed by said respective two ground yarns to form sinker loops each having a width longer than that of the corresponding needle loop in each said course of said ground fabric, and further wherein said ground yarns are selected from the group consisting of water-shrinkable and heat-shrinkable yarns, each of said pile yarns being worked into each course of said ground fabric and being alternately knitted together with a needle mesh of the respective ground fabrics to form raised loops, at least one of the ground yarns and pile yarns containing fibers selected from the group consisting of charge control fibers and electrically conductive fibers, said tubular fabric having a radial shrinking percentage of generally between about 20 to 25% and an axial shrinking percentage of generally between about 25 to 30%.
Claim 6
Dependent Claim
23 words
The antistatic cover of claim 3, wherein said ground yarn consists of nonacetalized polyvinyl alcoholic fibers, chemical fibers, reproduced fibers and natural fibers.
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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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |