US6080337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron oxide particles
Assignee: Neophotonics Corp
•
Filing: 1999-06-22
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Granted: 2000-06-27
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Expires: 2019-06-22
Abstract
Abstract Electromagnetic shielding material is formed from a shielding composition made with magnetic particles and a binder, where the magnetic particles have an average diameter less than about 1000 nm and are substantially crystalline. The magnetic particles can be formed from Fe 2 O 3 , Fe 3 O 4 , Fe 3 C, or Fe 7 C 3 . The shielding composition can be formed into a layer or into composite particles. The binder can be a metal or an electrically conducting polymer. A conducting layer can be placed adjacent to the shielding composition. The shielding material can be used to protect sensitive electronic devices. Methods are described for forming iron oxide particles by laser pyrolysis.
Inventors
- 👤 Nobuyuki Kambe
- 👤 Xiangxin Bi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:37
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; H01F1/37; H05K9/0088; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S977/00; Y10S977/70; Y10S977/832; Y10S977/838
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
71 words
A method of producing iron oxide particles comprising pyrolyzing a molecular stream comprising an iron precursor, an oxidizing agent and a radiation absorbing gas in a reaction chamber, where the pyrolysis is driven by heat absorbed from a light beam, the reaction taking place in a reaction zone in the vicinity of the light beam, wherein the particles are present following a quench as the reaction stream exits the reaction zone.
Claim 2
Independent Claim
71 words
A method of producing iron oxide particles comprising pyrolyzing a molecular stream comprising an iron precursor, an oxidizing agent and a radiation absorbing gas in a reaction chamber, where the pyrolysis is driven by heat absorbed from a light beam, the reaction taking place in a reaction zone in the vicinity of the light beam, wherein the particles are present following a quench as the reaction stream exits the reaction zone.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the laser beam is generated by a CO 2 laser.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the molecular stream is generated by a nozzle elongated in one dimension.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the light beam is supplied by a laser.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein the laser is a CO 2 laser.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the light beam is supplied by an arc lamp.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein the iron precursor is Fe(CO) 5 .
Claim 9
Dependent Claim
13 words
The method of claim 1 wherein the oxidizing agent is O 2 .
Claim 10
Dependent Claim
16 words
The method of claim 1 wherein the radiation absorbing gas comprises C 2 H 4 .
Claim 11
Dependent Claim
21 words
The method of claim 1 wherein the product particles have an average diameter from about 5 nm to about 500 nm.
Claim 12
Dependent Claim
21 words
The method of claim 1 wherein the product particles have an average diameter from about 5 nm to about 100 nm.
Claim 13
Dependent Claim
12 words
The method of claim 1 wherein the product particles are roughly spherical.
Claim 14
Dependent Claim
35 words
The method of claim 1 wherein about 95 percent of the product particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Claim 15
Dependent Claim
35 words
The method of claim 1 wherein about 95 percent of the product particles have a diameter greater than about 60 percent of the average diameter and less than about 140 percent of the average diameter.
Claim 16
Dependent Claim
12 words
The method of claim 1 wherein the product particles comprise crystalline particles.
References Cited (Backward Citations)
GB1039633A
Cited
US3406228A
Cited
US3954945A
Cited
US4048290A
Cited
US4371742A
Cited
US4548799A
Cited
US4554291A
Cited
US4468474A
Cited
US4705762A
Cited
US4548798A
Cited
US4840926A
Cited
JPS6252129A
Cited
JPS6312198A
Cited
US5013706A
Cited
US4963291A
Cited
US5207878A
Cited
US5225110A
Cited
US5091268A
Cited
US5075034A
Cited
US5030332A
Cited
US5264157A
Cited
US5266109A
Cited
US5366664A
Cited
US5314727A
Cited
US5417956A
Cited
US5447708A
Cited
US5358695A
Cited
US5519585A
Cited
US5783263A
Cited
JPH0758489A
Cited
US5554678A
Cited
JPH08165147A
Cited
EP0717418A2
Cited
US5617095A
Cited
US5714536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-06-27 | 2003-12-27 | 2004-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-06-27 | 2007-12-27 | 2008-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-06-27 | 2011-12-27 | 2012-06-27 | $7700.00 | Window Closed / Lapsed |