US4881576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hose for transport of refrigerant fluids and fuel oils
Assignee: Yokohama Rubber Co Ltd
•
Filing: 1987-12-11
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Granted: 1989-11-21
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Expires: 2007-12-11
Abstract
Abstract A hose for refrigerant fluid or fuel oil service which comprises a core tube, a reinforcing layer and an outer cover, the core tube being of a composite structure having an inner plastic peripheral wall, an intermediate plastic peripheral wall and an outer rubbery peripheral wall. The inner and intermediate walls are formed of a selected class of polyamides and polyolefins, whereby the hose is rendered highly impermeable to fluid and moisture, greatly resistant to stress cracking and sufficiently flexible.
Inventors
- 👤 Tetsu Kitami
- 👤 Jun Mito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:26
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/12; F16L11/08; F16L11/085; D; D04; D04C; D04C1/00; D04C1/06; D10; D10B; D10B2403/00; D10B2403/01; D10B2403/012; D10B2403/0122; D10B2505/00; D10B2505/02; Y; Y10; Y10S; Y10S138/00; Y10S138/07; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31728
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A hose for use in transporting refrigerant fluids or fuel oils which hose comprises: (a) a core tube comprising an inner peripheral wall, an intermediate peripheral wall and an outer peripheral wall, said inner wall being formed of a first resin which is predominately nylon 11 or nylon 12, or a combination thereof; said intermediate wall being formed of a second resin which essentially comprises 40-80% by weight of nylon 6 or nylon 6/66, 5-30% by weight of nylon 11 and 10-40% by weight of a polyolefin; and said outer wall being formed of a rubbery material; (b) a reinforcing layer laminated over said outer wall; and (c) an outer wall disposed outwardly around said reinforcing layer, said hose having a high gas impermeability and a high resistance to stress cracking.
Claim 2
Dependent Claim
131 words
A hose for use in transporting refrigerant fluids or fuel oils which hose comprises: (a) a core tube comprising an inner peripheral wall, an intermediate peripheral wall and an outer peripheral wall, said inner wall being formed of a first resin which is predominately nylon 11 or nylon 12, or a combination thereof; said intermediate wall being formed of a second resin which essentially comprises 40-80% by weight of nylon 6 or nylon 6/66, 5-30% by weight of nylon 11 and 10-40% by weight of a polyolefin; and said outer wall being formed of a rubbery material; (b) a reinforcing layer laminated over said outer wall; and (c) an outer wall disposed outwardly around said reinforcing layer, said hose having a high gas impermeability and a high resistance to stress cracking.
Claim 3
Dependent Claim
34 words
The hose of claim 1, wherein said first resin comprises more than 60% by weight of nylon 11 or nylon 12, or a combination thereof, and less than 40% by weight of nylon 6.
Claim 4
Dependent Claim
26 words
The hose of claim 1, said rubbery material being nitrile-butadiene rubber, chlorosulfonated polyethylene rubber, ethylene-propylene-diene rubber, butyl rubber, chlorinated butyl rubber, epichlorohydrin rubber or acrylic rubber.
Claim 5
Dependent Claim
60 words
The hose of claim 1, said inner wall having a thickness of 5-25 percent based on the total thickness of said inner tube, said intermediate wall having a thickness of 5-25 percent based on the total thickness of said inner tube, and said outer wall having a thickness of 50-90 percent based on the total thickness of said inner tube.
Claim 6
Dependent Claim
45 words
The hose of claim 1 having a gas impermeability of smaller than about 5 g/m/72 hours as determined at 100° C. for 96 hours, and a stress cracking resistance of longer than 30 days as determined at 100° C. on contact with aqueous zinc chloride.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |