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Patent US4282922A successfully refreshed from Google Patents.
US4282922A
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US
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Lead coated alumina fiber and lead matrix composites thereof
Assignee: EIDP Inc
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Filing: 1980-05-16
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Granted: 1981-08-11
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Expires: 2000-05-16
Abstract
Abstract Lead-coated alumina fibers which are obtained by reduction of lead oxide in a glass coating on alumina fibers are particularly useful for making strong lead matrix composites.
Inventors
- 👤 Hans S. Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:34
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/68; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/0745; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49801
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A process for preparing lead-coated alumina fibers useful for reinforcement in lead matrix composites, comprising applying to the alumina fibers a solution or dispersion of glass containing at least about 74% lead oxide or an equivalent amount of a precursor thereof, heating the coated fiber to form an adherent glass film on the fiber and submitting the coated fiber to a reducing atmosphere at a temperature of from 600° C. to 900° C. to reduce the lead oxide to metallic lead.
Claim 2
Dependent Claim
81 words
A process for preparing lead-coated alumina fibers useful for reinforcement in lead matrix composites, comprising applying to the alumina fibers a solution or dispersion of glass containing at least about 74% lead oxide or an equivalent amount of a precursor thereof, heating the coated fiber to form an adherent glass film on the fiber and submitting the coated fiber to a reducing atmosphere at a temperature of from 600° C. to 900° C. to reduce the lead oxide to metallic lead.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein the glass deposited on the fiber will yield between 0.3 and 4% of lead on the fiber after reduction.
Claim 4
Dependent Claim
37 words
A process according to claim 1 wherein the alumina fibers coated with the solution or dispersion of glass are heated in air at a temperature between 500° C. and 1000° C. to form an adherent glass film.
Claim 5
Dependent Claim
33 words
A process according to claim 1 wherein the glass contains at least about 45 mol % of PbO and about 10 to 50 mol % B 2 O 3 and/or SiO 2 .
Claim 6
Dependent Claim
24 words
A process for preparing a lead matrix composite wherein lead-coated alumina fibers of claim 1 are infiltrated with molten lead and the lead solidified.
References Cited (Backward Citations)
US2979424A
Cited
US2932071A
Cited
US3110939A
Cited
US3713865A
Cited
US3849181A
Cited
JPS5416515A
Cited
SU1731065A3
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |