US4131460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a sintered composition
Assignee: ZF International UK Ltd
•
Filing: 1977-03-17
•
Granted: 1978-12-26
•
Expires: 1997-03-17
Abstract
Abstract A method of producing a sintered composition used as a brush for a dynamo electric machine, includes the steps of compacting a powder from which the brush is to be made around one end of an electrical lead with the remainder of the lead projecting from the compacted powder, and then heating in a non-reducing atmosphere the assembly of the lead and the compacted powder to sinter the powder into the required brush and physically electrically connect the lead to the brush.
Inventors
- 👤 Raymond L. Orford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:49
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; B22F3/00; B22F3/12; B22F7/00; B22F7/06; B22F7/08; H; H01; H01R; H01R43/00; H01R43/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A method of producing a brush for a dynamo electric machine, including the steps of compacting a powder from which the brush is to be made comprising a mixture of silicon carbide, copper and carbon around one end of an electrical lead with the remainder of the lead projecting from the compacted powder, and then heating in a non-reducing atmosphere the assembly of the lead and the compacted powder to sinter the powder into the required brush and physically electrically connect the lead to the brush.
Claim 2
Independent Claim
86 words
A method of producing a brush for a dynamo electric machine, including the steps of compacting a powder from which the brush is to be made comprising a mixture of silicon carbide, copper and carbon around one end of an electrical lead with the remainder of the lead projecting from the compacted powder, and then heating in a non-reducing atmosphere the assembly of the lead and the compacted powder to sinter the powder into the required brush and physically electrically connect the lead to the brush.
Claim 3
Dependent Claim
14 words
A method as claimed in claim 1, wherein the lead is formed of copper.
Claim 4
Dependent Claim
16 words
A method as claimed in claim 2, wherein the copper contains 0.02-0.04% by weight of oxygen.
Claim 5
Dependent Claim
12 words
A method as claimed in claim 1, wherein said atmosphere is non-oxidising.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 1, wherein said atmosphere is a nitrogen or argon atmosphere.
Claim 7
Dependent Claim
25 words
A method as claimed in claim 1, wherein the mixture contains between 1-8% by weight of carbon and between 0.85-5.1% by weight of silicon carbide.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1, wherein compaction is effected at an applied load of between 10 and 35 tons F/in 2 .
Claim 9
Dependent Claim
21 words
A method as claimed in claim 1, wherein compaction is effected at an applied load of 19 tons F/in 2 .
Claim 10
Dependent Claim
21 words
A method as claimed in claim 1, wherein said heating step is effected at a temperature in the range 600°-880° C.
Claim 11
Dependent Claim
19 words
A method as claimed in claim 1, wherein said heating step is effected at a temperature of 800° C.
References Cited (Backward Citations)
US2353047A
Cited
US2823419A
Cited
US3214651A
Cited
US3392295A
Cited
US3358166A
Cited
US3601645A
Cited
US3489554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |