US4820571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature industrial fabrics
Assignee: Asten Inc
•
Filing: 1983-07-12
•
Granted: 1989-04-11
•
Expires: 2003-07-12
Abstract
Abstract An industrial fabric of woven monofilament threads comprised of a melt extrudable polyaryletherketone having improved high temperature resistance and hydrolysis resistance at elevated temperatures, such fabric exhibiting a high modulus of elongation making it particularly suitable for high temperature-high speed conveying applications in various industrial processing.
Inventors
- 👤 Harry I. Searfass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:01
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3065; Y10T442/3179; Y10T442/3976; Y10T442/3984
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
67 words
A papermaker's fabric having machine direction and cross machine direction threads interwoven with one another in a repeated pattern and finished into an endless belt with the threads of the belt being thermally set after weaving to stabilize the fabric, wherein certain of the threads are monofilaments of a melt extrudable polyaryletherketone selected from the group consisting of polyetherketones having repeating units of --φ--O--φ--CO--, --φ--O--φ--CO-- and/or --φ--O--φ--CO--φ--O--.
Claim 2
Dependent Claim
67 words
A papermaker's fabric having machine direction and cross machine direction threads interwoven with one another in a repeated pattern and finished into an endless belt with the threads of the belt being thermally set after weaving to stabilize the fabric, wherein certain of the threads are monofilaments of a melt extrudable polyaryletherketone selected from the group consisting of polyetherketones having repeating units of --φ--O--φ--CO--, --φ--O--φ--CO-- and/or --φ--O--φ--CO--φ--O--.
Claim 3
Dependent Claim
72 words
A papermaker's dryer fabric comprised of machine direction and cross machine direction threads interwoven with one another in a repeated pattern and thermally set after weaving to stabilize the fabric with a fabric open area between the range of more than 10% but less than 40% of the total fabric area, wherein certain of said threads are monofilaments of a melt extrudable polyaryletherketone consisting essentially of polyetheretherketone having repeat units of --φ--O--φ--CO--φ--O--.
Claim 4
Dependent Claim
72 words
A papermaker's dryer fabric comprised of machine direction and cross machine direction threads interwoven with one another in a repeated pattern and thermally set after weaving to stabilize the fabric with a fabric open area between the range of more than 10% but less than 40% of the total fabric area, wherein certain of said threads are monofilaments of a melt extrudable polyaryletherketone consisting essentially of polyetheretherketone having repeat units of --φ--O--φ--CO--φ--O--.
Claim 5
Dependent Claim
17 words
The fabric of claim 2, wherein said machine direction threads have a nominal diameter of 0.016 inches.
Claim 6
Dependent Claim
18 words
The fabric of claim 3 wherein said cross machine direction yarns have a normal diameter of 0.016 inches.
Claim 7
Dependent Claim
24 words
The fabric of claim 2 wherein said fabric is flat woven with a mesh count of 72 warp threads per inch at the reed.
Claim 8
Dependent Claim
17 words
The fabric of claim 5 wherein said machine direction threads have a normal diameter of 0.016 inches.
Claim 9
Dependent Claim
18 words
The fabric of claim 6 wherein said cross machine direction yarns have a nominal diameter of 0.016 inches.
Claim 10
Dependent Claim
28 words
The fabric of claim 2 wherein said monofilament threads have a thermal resistance of 90% retention of tensile strength after exposure to temperatures of up to 500° F.
Claim 11
Dependent Claim
13 words
The fabric of claim 2, wherein said fabric is a single layer fabric.
Claim 12
Dependent Claim
24 words
The fabric of claim 9 wherein said fabric has an open area between the range of 15 to 40 percent of total fabric area.
Claim 13
Dependent Claim
41 words
The fabric of claim 10 wherein said fabric has a hydrolysis resistance of maintaining substantially all of its initial tensile strength after exposure to moist heat of about 260° F. at 20 pounds per square inch for at least 72 hours.
Claim 14
Dependent Claim
23 words
The fabric of claim 11 wherein said fabric has a caustic resistance of maintaining at least 90 percent of the initial tensile strength.
Claim 15
Dependent Claim
15 words
The fabric of claim 2 wherein said fabric is at least a two ply fabric.
Claim 16
Dependent Claim
41 words
The fabric of claim 13 wherein said fabric has a hydrolysis resistance of maintaining substantially all of its initial tensile strength after exposure to moist heat of about 260° F. at 20 pounds per square inch for at least 72 hours.
Claim 17
Dependent Claim
23 words
The fabric of claim 14 wherein said fabric has a caustic resistance of maintaining at least 90 percent of the initial tensile strength.
Claim 18
Dependent Claim
15 words
The fabric according to claim 15 wherein said two ply weave is a balanced weave.
Claim 19
Dependent Claim
17 words
The fabric of claim 2 wherein said machine direction threads have a nominal diameter of 0.016 inches.
Claim 20
Dependent Claim
18 words
The fabric of claim 17 wherein said cross machine direction yarns have a nominal diameter of 0.016 inches.
Claim 21
Dependent Claim
21 words
The fabric of claim 2 wherein said threads of the belt are thermally set at a temperature greater than 400° F.
Claim 22
Dependent Claim
81 words
A papermaker's dryer fabric having machine direction and cross machine direction threads interwoven with one another in a repeated pattern and finished into an endless belt with the threads of the belt being thermally set after weaving to stabilize the fabric, wherein certain of the threads are of polyetheretherketone having hydrolysis resistance of maintaining at least 90% of the initial tensile strength after exposure to moist heat of 260° F. at 20 pounds per square inch for at least 72 hours.
Claim 23
Dependent Claim
81 words
A papermaker's dryer fabric having machine direction and cross machine direction threads interwoven with one another in a repeated pattern and finished into an endless belt with the threads of the belt being thermally set after weaving to stabilize the fabric, wherein certain of the threads are of polyetheretherketone having hydrolysis resistance of maintaining at least 90% of the initial tensile strength after exposure to moist heat of 260° F. at 20 pounds per square inch for at least 72 hours.
Claim 24
Dependent Claim
31 words
A papermaker's dryer fabric belt having machine direction and cross machine threads interwoven in a repeated pattern, wherein certain of the threads are of polyetheretherketone having repeating units essentially of --φ--O--φ--CO--φ--O.
Claim 25
Dependent Claim
31 words
A papermaker's dryer fabric belt having machine direction and cross machine threads interwoven in a repeated pattern, wherein certain of the threads are of polyetheretherketone having repeating units essentially of --φ--O--φ--CO--φ--O.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |