US4421819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear resistant paper machine fabric
Assignee: Jwi Ltd
•
Filing: 1982-09-30
•
Granted: 1983-12-20
•
Expires: 2002-09-30
Abstract
Abstract A heat set paper machine fabric having at least a portion of its wear resisting surface composed of cross-linked high density high molecular weight polyethylene.
Inventors
- 👤 Samuel M. Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:06
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; B01D2239/00; B01D2239/04; B01D2239/0471; Y; Y10; Y10S; Y10S162/00; Y10S162/90; Y10S162/903; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T442/00; Y10T442/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
36 words
A heat set paper making fabric woven of machine direction and cross-machine direction thermoplastic polymer yarns, wherein at least a portion of its wear resisting surface is composed of cross-linked high density high molecular weight polyethylene.
Claim 2
Dependent Claim
36 words
A heat set paper making fabric woven of machine direction and cross-machine direction thermoplastic polymer yarns, wherein at least a portion of its wear resisting surface is composed of cross-linked high density high molecular weight polyethylene.
Claim 3
Dependent Claim
49 words
A heat set paper making fabric woven of machine direction and cross-machine direction thermoplastic polymer yarns, wherein at least some of the yarns extending in the cross-machine direction, which have prominent knuckles on the wearing surface of the fabric, are composed of cross-linked high density high molecular weight polyethylene.
Claim 4
Dependent Claim
49 words
A heat set paper making fabric woven of machine direction and cross-machine direction thermoplastic polymer yarns, wherein at least some of the yarns extending in the cross-machine direction, which have prominent knuckles on the wearing surface of the fabric, are composed of cross-linked high density high molecular weight polyethylene.
Claim 5
Dependent Claim
56 words
A paper making fabric as claimed in claim 1 or 2 wherein said cross-linked high density high molecular weight polyethylene does not soften to the extent that it loses its shape and dimension when exposed to the heat setting temperature of said fabric which lies in the range of from about 170° C. to 220° C.
Claim 6
Dependent Claim
21 words
A monofilament for use in a paper making fabric said monofilament being composed of cross-linked high density high molecular weight polyethylene.
Claim 7
Dependent Claim
21 words
A monofilament for use in a paper making fabric said monofilament being composed of cross-linked high density high molecular weight polyethylene.
Claim 8
Dependent Claim
33 words
A monofilament for use in a paper making fabric, said monofilament being composed of a core material having desirable mechanical properties, said core being coated with cross-linked high density high molecular weight polyethylene.
Claim 9
Dependent Claim
33 words
A monofilament for use in a paper making fabric, said monofilament being composed of a core material having desirable mechanical properties, said core being coated with cross-linked high density high molecular weight polyethylene.
References Cited (Backward Citations)
US3158984A
Cited
US4041989A
Cited
US4093512A
Cited
US4289173A
Cited
DE2810429A1
Cited
US4276348A
Cited
US4297414A
Cited
US4184519A
Cited
US4314589A
Cited
US4281688A
Cited
US4259394A
Cited
US4350731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |