Patent US3751271A successfully refreshed from Google Patents.
US3751271A
Expired / Lapsed
US
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Sintered filter having straight holes therethrough
Assignee: TOYOTA KK
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Filing: 1971-05-11
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Granted: 1973-08-07
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Expires: 1991-05-11
Abstract
Abstract A sintered metal, or ceramic filter having parallel, straight holes of uniform diameter and with smooth inner surfaces passing therethrough is formed by sintering a green compact about a large number of straight wires arranged parallel to one another. Upon application of heat at a sintering temperature above the melting point of the wire material and less than the melting point of the sintering powders, the wires are absorbed into the pores of the sintering powders and leave holes of the same shape and size as the original wires in the resulting sintered filter.
Inventors
- 👤 T Kimura
- 👤 H Hamamoto
- 👤 A Majima
- 👤 M Tomatsu
- 👤 Y Awano
- 👤 Y Inaguma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:59
CPC Classifications
B; B22; B22F; B22F5/00; B22F5/10; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031; B01D39/2034; B01D39/2068; B01D39/2072; B01D39/2075; B22F3/00; B22F3/10; B22F3/11; B22F3/1103; B22F3/1121; B22F3/1134; B22F2005/103; B22F2998/00; B22F2999/00; Y; Y10; Y10S; Y10S425/00; Y10S425/812; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153; Y10T428/1216; Y10T428/12174; Y10T428/12361; Y10T428/12479; Y10T428/4935
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
A filter as claimed in claim 1, wherein said sintered matrix is made of one powder selected from the group consisting of iron, iron base alloys, tungsten, tungsten base alloys, molybdenum and stainless steel, and said infiltrated material being copper.
Claim 2
Dependent Claim
21 words
A filter as claimed in claim 1, wherein said sintered matrix is made of chromium and said infiltrated material is iron.
Claim 3
Dependent Claim
45 words
A filter as claimed in claim 1, wherein said sintered matrix is made of one powder selected from the group consisting of chromium carbide and titanium carbide, and said infiltrated material is one selected from the group consisting of Iron, nickel and nickel chromium alloys.
Claim 4
Dependent Claim
21 words
A filter as claimed in claim 1, wherein said sintered matrix is made of alumina and said infiltrated material is glass.
Claim 5
Dependent Claim
67 words
A sintered filter having uniform and straight, parallel holes with smooth inner surfaces, comprising a sintered body and a plurality of holes therethrough which are straight and parallel to each other, said sintered body consisting essentially of a sintered iron matrix having a network structure and copper infiltrated within said sintered iron matrix for reinforcing said sintered iron matrix and smoothening the wall surfaces of said holes.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |