US4476256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction material for brake linings and the like
Assignee: Boeing North American Inc
•
Filing: 1984-01-23
•
Granted: 1984-10-09
•
Expires: 2004-01-23
Abstract
Abstract A friction material for brake linings is formed using a polystilbazole resin (3-16% by weight) to provide the matrix for the material. The balance of the material is filler material such as steel wool, metal powders, carbon, ceramic powders, and friction modifiers. The lining is produced by mixing the ingredients and hot pressing the mixture at temperatures which promote the flow and cure of the resin, and at pressures which produce a material of suitable density.
Inventors
- 👤 Charles L. Hamermesh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:11
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; C; C08; C08K; C08K13/00; C08K13/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
13 words
A friction material comprising: 3-16% by weight polystilbazole resin; and balance filler material.
Claim 2
Dependent Claim
13 words
A friction material comprising: 3-16% by weight polystilbazole resin; and balance filler material.
Claim 3
Dependent Claim
28 words
The friction material as claimed in claim 1 wherein said polystilbazole resin is selected from the group consisting of polystyryl pyridine (PSP) and addition curing polystyryl pyridine (APSP).
Claim 4
Dependent Claim
18 words
The friction material as claimed in claim 1 wherein said filler material comprises fibrous reinforcement and friction modifiers.
Claim 5
Dependent Claim
34 words
A friction material comprising: 3-16% by weight polystilbazole resin; 10-50% by weight metal fibers; 22-68% by weight metal powders; 2-28% by weight carbon; 1-11% by weight ceramic powders; and 0-24% by weight friction modifier.
Claim 6
Dependent Claim
34 words
A friction material comprising: 3-16% by weight polystilbazole resin; 10-50% by weight metal fibers; 22-68% by weight metal powders; 2-28% by weight carbon; 1-11% by weight ceramic powders; and 0-24% by weight friction modifier.
Claim 7
Dependent Claim
14 words
The material as claimed in claim 4 wherein said metal fiber comprises steel fibers.
Claim 8
Dependent Claim
72 words
A friction material comprising: 3-16% by weight of a polystilbazole resin selected from the group consisting of polystyryl pyridine (PSP) and addition curing polystyryl pyridine (APSP); 10-50% by weight steel fibers; 22-68% by weight iron powder; 4-28% by weight of carbon selected from the group consisting of graphite and carbon black; 1-11% by weight of ceramic powder selected from the group consisting of alumina, zirconium silicate, talc, and magnesia; and 0-24% barytes.
Claim 9
Dependent Claim
72 words
A friction material comprising: 3-16% by weight of a polystilbazole resin selected from the group consisting of polystyryl pyridine (PSP) and addition curing polystyryl pyridine (APSP); 10-50% by weight steel fibers; 22-68% by weight iron powder; 4-28% by weight of carbon selected from the group consisting of graphite and carbon black; 1-11% by weight of ceramic powder selected from the group consisting of alumina, zirconium silicate, talc, and magnesia; and 0-24% barytes.
Claim 10
Dependent Claim
49 words
A brake lining comprising: 6.5-10% by weight addition curing polystyryl pyridine (APSP); 2-18% by weight graphite; 0-2% by weight carbon black; 34-42% by weight steel fibers; 0-1% by weight zirconium silicate; 0-3% by weight talc; 0-5% by weight magnesia; 22-26% by weight iron powder; and 12-14% by weight barytes.
Claim 11
Dependent Claim
49 words
A brake lining comprising: 6.5-10% by weight addition curing polystyryl pyridine (APSP); 2-18% by weight graphite; 0-2% by weight carbon black; 34-42% by weight steel fibers; 0-1% by weight zirconium silicate; 0-3% by weight talc; 0-5% by weight magnesia; 22-26% by weight iron powder; and 12-14% by weight barytes.
Claim 12
Dependent Claim
21 words
A friction material comprising: 3-16% by weight polystilbazole resin, 10-50% by weight steel fiber, and balance metal powders and friction modifiers.
Claim 13
Dependent Claim
21 words
A friction material comprising: 3-16% by weight polystilbazole resin, 10-50% by weight steel fiber, and balance metal powders and friction modifiers.
Claim 14
Dependent Claim
28 words
The friction material as claimed in claim 8 wherein said polystilbazole resin is selected from the group consisting of polystyryl pyridine (PSP) and addition curing polystyryl pyridine (APSP).
Claim 15
Independent Claim
69 words
A method of fabricating a friction material, comprising the steps of: providing 3-16% by weight polystilbazole resin; providing the balance filler material; mixing said resin and said filler material; placing the mixture of resin and filler material in a mold; hot pressing said mixture at temperatures which promote flow and cure of said resin and at pressures to provide sufficient density; and removing the hot-pressed mixture from said mold.
Claim 16
Independent Claim
69 words
A method of fabricating a friction material, comprising the steps of: providing 3-16% by weight polystilbazole resin; providing the balance filler material; mixing said resin and said filler material; placing the mixture of resin and filler material in a mold; hot pressing said mixture at temperatures which promote flow and cure of said resin and at pressures to provide sufficient density; and removing the hot-pressed mixture from said mold.
Claim 17
Dependent Claim
37 words
The method as claimed in claim 10, wherein said resin comprises polystyryl pyridine (PSP) and said hot pressing step comprising applying a pressure of approximately 9,000 psi minimum at a temperature of at least 480 degrees F.
Claim 18
Dependent Claim
62 words
The method as claimed in claim 10, wherein said resin comprises addition curing polystyryl pyridine (APSP) and said hot pressing step comprises applying a pressure of approximately 9,000 psi minimum while holding at a temperature of approximately 275 degrees F., and then raising the temperature to approximately 350 degrees F., and holding at 350 degrees F. to complete cure of said resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |