US4306729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing material
Assignee: Nok Corp
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Filing: 1979-09-26
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Granted: 1981-12-22
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Expires: 1999-09-26
Abstract
Abstract There is provided a sealing material comprising 100 parts by weight of a fibrous material made of polyester, polyamide or the like which constitutes a non-woven cloth; and 10 to 150 parts by weight, based on the weight after dried and hardened, of one or a mixture of a styrene-butadiene polymer base latex, an acrylonitrile-butadiene polymer base latex, an acrylic ester polymer base latex, a polysiloxane base latex and/or a fluorine-contained rubber base latex impregnated in the fibrous material.
Inventors
- 👤 Fumio Hiramatsu
- 👤 Kenichi Ohsone
- 👤 Tatsuaki Yukimasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3232; F16J15/3284; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/944
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A sealing material for a dust lip extending from a base portion of a main lip of a rubber oil seal comprising a non-woven cloth impregnated with a latex, wherein 100 parts by weight of a fibrous material constituting said non-woven cloth is impregnated with 10 to 150 parts by weight of said latex when weighed after dried and hardened, said material having a permeability of more than 5 cc per cm 2 .Sec.
Claim 2
Dependent Claim
74 words
A sealing material for a dust lip extending from a base portion of a main lip of a rubber oil seal comprising a non-woven cloth impregnated with a latex, wherein 100 parts by weight of a fibrous material constituting said non-woven cloth is impregnated with 10 to 150 parts by weight of said latex when weighed after dried and hardened, said material having a permeability of more than 5 cc per cm 2 .Sec.
Claim 3
Dependent Claim
18 words
A sealing material according to claim 1, wherein said fibrous material constituting said non-woven cloth is a polyester.
Claim 4
Dependent Claim
44 words
A sealing material according to claim 1, wherein said latex is one selected from the group comprising a styrene-butadiene polymer base latex, an acrylonitrile-butadiene polymer base latex, an acrylic ester polymer base latex, a silicone rubber base latex and a fluorine-contained rubber base latex.
Claim 5
Dependent Claim
20 words
A sealant material according to claim 1, wherein the thickness of said non-woven cloth ranges from 0.3 to 3 mm.
Claim 6
Dependent Claim
26 words
A sealing material according to claim 1, wherein said non-woven cloth is punched by a needle punch to prevent peeling at the interface between the plies.
Claim 7
Dependent Claim
18 words
A sealing material according to claim 1, wherein said fibrous material constituting said non-woven cloth is a polyamide.
Claim 8
Dependent Claim
47 words
A sealing material according to claim 1, wherein said latex is a mixture of at least two latexes selected from a styrene-butadiene polymer base latex, an acrylonitrile-butadiene polymer base latex, an acrylic ester polymer base latex, a silicone rubber base latex and a fluorine-contained rubber base latex.
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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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |