US4013461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High void porous sheet and process therefor
Assignee: Graftech Technology LLC
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Filing: 1975-05-08
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Granted: 1977-03-22
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Expires: 1995-05-08
Abstract
Abstract A method of making a high void porous sheet by sintering metallic coated hollow carbonaceous particles and sheets made by such method.
Inventors
- 👤 Raymond John Elbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:57
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1103; B22F3/1112; B22F2998/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A process for fabricating high void, porous sheets comprising the following steps: a. preparing hollow carbonaceous particles having a diameter no greater than 0.030 inch; b. depositing a metallic layer on said particles, said metallic layer being non-reactant with said particles at the sintering temperature of the metallic material; c. preparing a green sheet consisting of said metallic coated hollow particles; d. heating said green sheet above the sintering temperature of said metallic material so as to bond said material thereby producing a high void, porous sheet; e. depositing a melting point depressant on said sintered porous sheet; and f. heating said coated sintered sheet to a temperature sufficient to cause liquid phase sintering.
Claim 2
Dependent Claim
114 words
A process for fabricating high void, porous sheets comprising the following steps: a. preparing hollow carbonaceous particles having a diameter no greater than 0.030 inch; b. depositing a metallic layer on said particles, said metallic layer being non-reactant with said particles at the sintering temperature of the metallic material; c. preparing a green sheet consisting of said metallic coated hollow particles; d. heating said green sheet above the sintering temperature of said metallic material so as to bond said material thereby producing a high void, porous sheet; e. depositing a melting point depressant on said sintered porous sheet; and f. heating said coated sintered sheet to a temperature sufficient to cause liquid phase sintering.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said metallic material is selected from at least one of the elements nickel, copper, tungsten and aluminum.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said metallic material is selected from at least one of the elements of nickel, copper, tungsten and aluminum.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein said melting point depressant is phosphoric acid.
Claim 6
Dependent Claim
12 words
A high void, porous sheet made by the process of claim 1.
Claim 7
Dependent Claim
51 words
The process of claim 1 wherein said hollow particles in step (a) measure between about 0.001 inch and about 0.010 inch in diameter and between about 0.0001 inch and about 0.001 inch in thickness and wherein the thickness of said metallic layer is between about 0.0001 inch and about 0.001 inch.
Claim 8
Dependent Claim
27 words
The process of claim 6 wherein said hollow particles are carbon, said metallic layer is nickel and said temperature in step (d) is above about 1100° C.
Claim 9
Dependent Claim
23 words
The process of claim 6 wherein the temperature in step (d) is below about 1450° C. so as to cause liquid phase sintering.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein said melting point depressant is phosphoric acid.
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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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |