Patent US5960834A successfully refreshed from Google Patents.
US5960834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curved pipe and process and apparatus for producing the same
Assignee: Toray Industries Inc
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Filing: 1994-08-26
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Granted: 1999-10-05
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Expires: 2014-08-26
Abstract
Abstract An FRP curved pipe, particularly suitable for an FRP racket, good in resin flowability and deaeration at the time of molding, less in surface defects and excellent in strength can be obtained by a structure comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 μm and a weight per unit area of not greater than 100 g/m 2 .
Inventors
- 👤 Toshihide Sekido
- 👤 Ryoichi Matsuura
- 👤 Tetsuyuki Kyono
- 👤 Kazuhiko Nishimura
- 👤 Kosuke Yoshimura
- 👤 Shinya Isoi
- 👤 Haruo Obara
- 👤 Hiromitsu Kanamori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:29
CPC Classifications
B; B32; B32B; B32B1/00; B32B1/08; B62; B62K; B62K19/00; B62K19/02; B62K19/16; A; A63; A63B; A63B49/00; A63B49/02; A63B49/10; A63B49/11; A63B60/00; A63B60/06; A63B60/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
49 words
A curved pipe of fiber reinforced plastics material comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 μm and a weight per unit area of not greater than 100 g/m 2 .
Claim 2
Dependent Claim
49 words
A curved pipe of fiber reinforced plastics material comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 μm and a weight per unit area of not greater than 100 g/m 2 .
Claim 3
Dependent Claim
23 words
The curved pipe according to claim 1, wherein said inner layer includes a unidirectionally aligned material and a woven fabric of reinforcing fibers.
Claim 4
Dependent Claim
55 words
The curved pipe according to claim 1, wherein said inner layer has four or fewer reinforcing fiber partial layers, each reinforcing fiber partial layer has plural laminae of reinforcing fiber materials and a C-shape cross section, and an opening of an inner reinforcing fiber partial layer is covered with an outer reinforcing fiber partial layer.
Claim 5
Dependent Claim
22 words
The curved pipe according to claim 1, wherein said inner layer includes a unidirectionally aligned material and a braid of reinforcing fibers.
Claim 6
Dependent Claim
27 words
The curved pipe according to any of claims 1 to 3 or 4, wherein fibers forming said non-woven fabric have fiber lengths of 1 to 30 mm.
Claim 7
Dependent Claim
27 words
The curved pipe according to any of claims 1 to 3 or 4, wherein said outer layer is disposed over the full length of the curved pipe.
Claim 8
Dependent Claim
27 words
The curved pipe according to any of claims 1 to 3 or 4, wherein said outer layer is disposed over the full circumference of the curved pipe.
Claim 9
Dependent Claim
50 words
A racket made from a fiber reinforced plastics material comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 μm and a weight per unit area of not greater than 100 g/m 2 .
Claim 10
Dependent Claim
50 words
A racket made from a fiber reinforced plastics material comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 μm and a weight per unit area of not greater than 100 g/m 2 .
Claim 11
Dependent Claim
23 words
The racket according to claim 8, wherein reinforcing fibers are selected from the group consisting of carbon fibers, glass fibers and polyaramide fibers.
Claim 12
Dependent Claim
24 words
The racket according to claim 8 or 9, wherein said inner layer includes a unidirectionally aligned material and a woven fabric of reinforcing fibers.
Claim 13
Dependent Claim
58 words
The racket according to any of claim 8 or 9, wherein said inner layer has four or less reinforcing fiber partial layers, each reinforcing fiber partial layer has plural laminae of reinforcing fiber materials and a C-shape cross section, and an opening of an inner reinforcing fiber partial layer is covered with an outer reinforcing fiber partial layer.
Claim 14
Dependent Claim
30 words
The racket according to any of claim 8 or 9, wherein fibers forming said non-woven fabric are selected from the group consisting of carbon fibers, glass fibers and polyaramide fibers.
Claim 15
Dependent Claim
24 words
The racket according to any of claim 8 or 9, wherein fibers forming said non-woven fabric have fiber lengths of 1 to 30 mm.
Claim 16
Dependent Claim
26 words
The racket according to any of claim 8 or 9, wherein said outer layer is disposed on a portion other than a grip of the racket.
Claim 17
Dependent Claim
27 words
The racket according to any of claim 8 or 9, wherein said outer layer is disposed on a portion other than a groove portion for gut strings.
Claim 18
Dependent Claim
35 words
The racket according to any of claim 8 or 9, wherein a wood material or a honeycomb material is disposed at least partially inside of said inner layer provided on a frame and/or a yoke.
Claim 19
Dependent Claim
24 words
The racket according to any of claim 8 or 9, wherein said inner layer provided on a grip is covered with a wood material.
Claim 20
Dependent Claim
23 words
The racket according to claim 8 or 9, wherein said inner layer includes a unidirectionally aligned material and a braid of reinforcing fibers.
References Cited (Backward Citations)
US3481369A
Cited
US3881522A
Cited
US4139025A
Cited
US4217935A
Cited
US4657795A
Cited
US5080943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-10-04 | 2003-04-05 | 2003-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-04 | 2007-04-05 | 2007-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-04 | 2011-04-05 | 2011-10-05 | $7700.00 | Window Closed / Lapsed |