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US4273699A Expired / Lapsed US ⏱️ 0.0 years remaining

Friction materials

Assignee: Federal Mogul Friction Products Ltd
•
Filing: 1978-07-31
•
Granted: 1981-06-16
•
Expires: 1998-07-31
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Abstract

Abstract The invention concerns a composition for a friction material e.g. for a brake pad, of the type containing a fibrous reinforcement, a binder and various additives. The composition contains a thermoset binder including a phenol-formaldehyde resin and making up 20 to 60% by volume of the material. Besides the resin the binder can also include a heat and chemical resistant rubber, but the phenol-formaldehyde resin makes up at least 10% by volume of the composition. The composition includes a fibre-based reinforcement which makes up 10 to 35% by volume of the material and consists of a mixture of steel fibres or glass fibres with one or more other non-asbestos inorganic reinforcing materials e.g. steel fibre and mica, or steel fibre and milled glass. The friction material contains no asbestos, but has properties comparable with asbestos-based materials.

Inventors

  • 👤 John Chester

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 07:54
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 106 words
An asbestos-free friction material composition for molded friction pads consisting essentially of thermosetting binder, a fiber-based reinforcement and other fillers and additives, wherein (a) the thermoset binder comprises a phenol-formaldehyde resin, (b) the thermoset binder constitutes 20% to 60% by volume of the composition of which at least half is said phenol formaldehyde resin, (c) the fiber-based reinforcement consists essentially of a mixture of staple steel fibers and short lengths of milled glass fiber, (d) the fiber-based reinforcement constitutes 10% to 35% by volume of the composition, and (e) the balance of the composition consists essentially of inorganic friction and wear modifiers and particulate inorganic fillers.
Claim 2
Dependent Claim 106 words
An asbestos-free friction material composition for molded friction pads consisting essentially of thermosetting binder, a fiber-based reinforcement and other fillers and additives, wherein (a) the thermoset binder comprises a phenol-formaldehyde resin, (b) the thermoset binder constitutes 20% to 60% by volume of the composition of which at least half is said phenol formaldehyde resin, (c) the fiber-based reinforcement consists essentially of a mixture of staple steel fibers and short lengths of milled glass fiber, (d) the fiber-based reinforcement constitutes 10% to 35% by volume of the composition, and (e) the balance of the composition consists essentially of inorganic friction and wear modifiers and particulate inorganic fillers.
Claim 3
Dependent Claim 21 words
A friction material according to claim 1 wherein said staple steel fibers constitute at least half the volume of said reinforcement.
Claim 4
Dependent Claim 18 words
A friction material according to claim 2 wherein said particulate filler is barytes, whiting, silica or mixtures thereof.
Claim 5
Dependent Claim 27 words
A friction material according to claim 2 wherein said friction or wear modifiers are carbon, graphite, antimony trisulfide, molybdenum disulfide or finely divided brass, copper or tin.

References Cited (Backward Citations)

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FR1363324A Cited
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FR1575746A Cited
GB1206554A Cited
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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) 1984-06-15 1984-12-15 1985-06-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-06-15 1988-12-15 1989-06-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-06-15 1992-12-15 1993-06-16 $7700.00 Window Closed / Lapsed

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