US4256801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon fiber/flame-resistant organic fiber sheet as a friction material
Assignee: Raybestos Products Co
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Filing: 1979-12-14
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Granted: 1981-03-17
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Expires: 1999-12-14
Abstract
Abstract Paper base friction material in the form of a porous, flexible interfelted fibrous sheet comprised of a mixture of 25 to 65 percent cellulose fibers, 5 to 20 percent carbon fibers, 5 to 20 percent flame-resistant organic fibers, fillers, and an oil resistant elastomeric sizing. The friction material also includes a synthetic resin binder which may be incorporated during preparation of the sheet or subsequently. In use, the paper base friction material is bonded to a supporting member, preferably metal, whereby it is useful as a friction element particularly in oil, such as in automotive automatic transmissions.
Inventors
- 👤 Philip A. Chuluda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:06
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/12; B; B32; B32B; B32B15/00; B32B15/04; B32B15/12; B32B29/00; B32B29/002; D21H13/00; D21H13/10; D21H13/20; D21H13/36; D21H13/46; D21H13/50; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/46; D21H17/47; D21H17/48; D21H17/63; D21H17/67; D21H17/68; F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; B32B2260/00; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/70; B32B2307/744; B32B2475/00; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/92; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/249987; Y10T428/24999; Y10T428/25; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2982; Y10T428/30; Y10T442/00; Y10T442/50; Y10T442/51; Y10T442/53
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
89 words
Friction material in porous, flexible, interfelted fibrous sheet form comprising a mixture of from about 25 to about 65 percent cellulose fibers, from about 5 to about 20 percent of carbon fibers, from about 5 to about 20 percent of flame-resistant organic fibers, up to about 30 percent of graphite particles, up to about 30 percent of diatomaceous earth particles, and a small amount of a sizing effective to increase the tensile strength of said sheet, said percentages being by weight based on the total weight of said sheet.
Claim 2
Dependent Claim
89 words
Friction material in porous, flexible, interfelted fibrous sheet form comprising a mixture of from about 25 to about 65 percent cellulose fibers, from about 5 to about 20 percent of carbon fibers, from about 5 to about 20 percent of flame-resistant organic fibers, up to about 30 percent of graphite particles, up to about 30 percent of diatomaceous earth particles, and a small amount of a sizing effective to increase the tensile strength of said sheet, said percentages being by weight based on the total weight of said sheet.
Claim 3
Dependent Claim
79 words
A friction material according to claim 1 comprising from about 40 to about 65 percent cellulose fibers, from about 5 to about 15 percent carbon fibers, from about 5 to about 15 percent flame-resistant organic fibers, from about 20 to about 30 percent graphite particles, from about 5 to about 15 percent diatomaceous earth particles, and from about 5 to about 10 percent of sizing solids, said percentages being by weight based on the total weight of said sheet.
Claim 4
Dependent Claim
24 words
A friction material according to claim 1 in which said graphite particles are flake graphite particles, and said sizing comprises an oil resistant elastomer.
Claim 5
Dependent Claim
16 words
A friction material according to claim 1 in which said flame-resistant organic fibers comprise novoloid fibers.
Claim 6
Dependent Claim
49 words
A friction material according to claim 1 in which said sheet is impregnated with an amount of a synthetic thermosetting resin such that said sheet material has a final porosity of from about 40 percent to about 55 percent after compression in bonding said sheet to a supporting member.
Claim 7
Dependent Claim
19 words
A friction material according to claim 5 in which said synthetic thermosetting resin comprises a one-step phenol formaldehyde resin.
Claim 8
Dependent Claim
58 words
A friction material according to claim 1 in which said carbon fibers have a diameter of from about 5 to 20 microns and a length of from about 0.4 to 3 millimeters, and said flame-resistant organic fibers have a diameter of from about 9 to about 35 microns and a length of from about 0.2 to 2 millimeters.
Claim 9
Dependent Claim
40 words
A friction material according to claim 1 comprising about 40 percent cellulose fibers, about 5 percent carbon fibers, about 5 percent flame-resistant organic fibers, about 30 percent graphite, about 13 percent diatomaceous earth and about 5 percent of sizing solids.
Claim 10
Dependent Claim
43 words
A friction material according to claim 8 in which said sheet is impregnated with an amount of a synthetic thermosetting resin such that said sheet has a final porosity of about 47 percent after compression in bonding said sheet to a supporting member.
Claim 11
Dependent Claim
23 words
A friction material according to claim 9 in which said flame-resistant fibers comprise novoloid fibers and said sizing comprises oil resistant acrylonitrile elastomer.
Claim 12
Dependent Claim
17 words
A friction material according to claim 10 in which said resin comprises a one-step phenol formaldehyde resin.
Claim 13
Dependent Claim
157 words
A friction element for engaging mechanisms adapted to operate in oil comprising a support member and a friction facing bonded to said support member, said friction facing being in the form of a porous, flexible, interfelted fibrous sheet comprising a mixture of from about 25 to about 65 percent cellulose fibers, from about 5 to about 20 percent of carbon fibers, from about 5 to about 20 percent of flame-resistant organic fibers, up to about 30 percent of graphite particles, up to about 30 percent of diatomaceous earth particles, and a small amount of a sizing effective to increase the tensile strength of said sheet, said percentages being by weight based on the total weight of said sheet, said sheet being impregnated with an amount of a synthetic thermosetting resin such that said sheet has a final porosity of from about 40 percent to about 55 percent after compression in bonding said sheet to said support member.
Claim 14
Dependent Claim
157 words
A friction element for engaging mechanisms adapted to operate in oil comprising a support member and a friction facing bonded to said support member, said friction facing being in the form of a porous, flexible, interfelted fibrous sheet comprising a mixture of from about 25 to about 65 percent cellulose fibers, from about 5 to about 20 percent of carbon fibers, from about 5 to about 20 percent of flame-resistant organic fibers, up to about 30 percent of graphite particles, up to about 30 percent of diatomaceous earth particles, and a small amount of a sizing effective to increase the tensile strength of said sheet, said percentages being by weight based on the total weight of said sheet, said sheet being impregnated with an amount of a synthetic thermosetting resin such that said sheet has a final porosity of from about 40 percent to about 55 percent after compression in bonding said sheet to said support member.
Claim 15
Dependent Claim
60 words
A friction element according to claim 12 in which said sheet comprises from about 40 to about 65 percent cellulose fibers, from about 5 to about 15 percent carbon fibers, from about 5 to about 15 percent flame-resistant organic fibers, from about 20 to about 30 percent graphite particles, and from about 5 to about 10 percent of sizing solids.
Claim 16
Dependent Claim
24 words
A friction element according to claim 12 in which said graphite particles are flake graphite particles, and said sizing comprises an oil resistant elastomer.
Claim 17
Dependent Claim
16 words
A friction element according to claim 12 in which said flame-resistant organic fibers comprises novoloid fibers.
Claim 18
Dependent Claim
19 words
A friction element according to claim 15 in which said synthetic thermosetting resin comprises a one-step phenol formaldehyde resin.
Claim 19
Dependent Claim
58 words
A friction element according to claim 12 in which said carbon fibers have a diameter of from about 5 to 20 microns and a length of from about 0.4 to 3 millimeters, and said flame-resistant organic fibers have a diameter of from about 9 to about 35 microns and a length of from about 0.2 to 2 millimeters.
Claim 20
Dependent Claim
44 words
A friction element according to claim 12 in which said sheet comprises about 40 percent cellulose fibers, about 5 percent carbon fibers, about 5 percent flame-resistant organic fibers, about 30 percent graphite, about 13 percent diatomaceous earth and about 5 percent of sizing solids.
Claim 21
Dependent Claim
43 words
A friction element according to claim 18 in which said sheet is impregnated with an amount of a synthetic thermosetting resin such that said sheet has a final porosity of about 47 percent after compression in bonding said sheet to said support member.
Claim 22
Dependent Claim
23 words
A friction element according to claim 19 in which said flame-resistant fibers comprise novoloid fibers and said sizing comprises oil resistant acrylonitrile elastomer.
Claim 23
Dependent Claim
17 words
A friction element according to claim 20 in which said resin comprises a one-step phenol formaldehyde resin.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |