US4564985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Felt for paper manufacture and method for producing the same
Assignee: Nippon Felt Co Ltd
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Filing: 1982-10-07
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Granted: 1986-01-21
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Expires: 2002-10-07
Abstract
Abstract A felt for paper manufacture and the method for producing the felt. At least two fabrics having a single weave or double combination weave structure are piled to form a ground fabric. A lap is fed on the ground fabric and the lap and fabrics of the ground fabric are combined with each other by needling.
Inventors
- 👤 Takeo Tanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:22
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10S; Y10S428/00; Y10S428/909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
A method for producing a felt for paper manufacture, which comprises subjecting at least two endless non-compressible fabrics having at least one of a single weave or double combination weave structure to stretching and setting so that the endless non-compressible fabrics are thermally set under such a tension as will keep a substantially equal length in the fabrics, piling the fabrics in the annular form to form a ground fabric, placing a lap on said ground fabric, and needling the lap placed on the ground fabric while travelling the ground fabric under such a tension that all the layers are kept strained, whereby the lap is combined with the surface of the ground fabric and the endless non-compressible fabrics are also combined with each other.
Claim 2
Independent Claim
125 words
A method for producing a felt for paper manufacture, which comprises subjecting at least two endless non-compressible fabrics having at least one of a single weave or double combination weave structure to stretching and setting so that the endless non-compressible fabrics are thermally set under such a tension as will keep a substantially equal length in the fabrics, piling the fabrics in the annular form to form a ground fabric, placing a lap on said ground fabric, and needling the lap placed on the ground fabric while travelling the ground fabric under such a tension that all the layers are kept strained, whereby the lap is combined with the surface of the ground fabric and the endless non-compressible fabrics are also combined with each other.
Claim 3
Dependent Claim
40 words
A method for producing a felt for paper manufacture as set forth in claim 1, wherein the at least two fabrics are subjected to stretching and setting in the state in which the fabrics are piled in the annular form.
Claim 4
Dependent Claim
43 words
A method for producing a felt for paper manufacture as set forth in claim 1, wherein the stretching is carried out under a tension produced by a force of approximately 2.5 kg/cm 2 initially which is gradually reduced to 1.5 kg/cm 2 .
Claim 5
Dependent Claim
24 words
A method for producing a felt for paper manufacture as set forth in claim 1, wherein the thermal setting is accomplished with hot air.
Claim 6
Dependent Claim
24 words
A method as set forth in claim 1, wherein the thermal setting is accomplished at a temperature of between 150° centigrade and 160° centigrade.
Claim 7
Dependent Claim
46 words
A method for producing a felt for paper manufacture as set forth in claim 1, wherein the needling is accomplished with the ground fabric under a tension produced by a force which is on the average from about 0.3 to about 5 kg/cm 2 per fabric.
Claim 8
Dependent Claim
36 words
A method for producing a felt for paper manufacture as set forth in claim 1, wherein the at least two fabrics are independently subjected to stretching and setting prior to being piled in the annular form.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |