US4844736A
Expired / Lapsed
US
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Method for the preparation of finely divided metal particles
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1987-10-29
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Granted: 1989-07-04
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Expires: 2007-10-29
Abstract
Abstract A compound of a metallic element, e.g., tetramethyl lead, trimethyl bismuth, etc. in a vapor phase can be efficiently decomposed in a chain reaction of a very large apparent quantum yield to form extremely finely divided high-purity particles of the metallic element by the irradiation with actinic rays, e.g., laser beams, when the concentration of the metallic compound in the vapor phase is at least 1×10 15 molecules per cm 3 and the energy density of the actinic rays is at least 1×10 -3 Joule per cm 2 .
Inventors
- 👤 Nobuo Shimo
- 👤 Keitaro Yoshihara
- 👤 Nobuaki Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:45
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/30; C; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/221; C22B9/223
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
58 words
A method for the preparation of finely divided particles of a metallic element which comprises irradiating a compound of the metallic element in a vapor phase containing at least 1×10 15 molecules of the compound per cm 3 with rays of a laser beam having an energy density of at least 1×10 -3 Joule per cm 2 .
Claim 2
Independent Claim
58 words
A method for the preparation of finely divided particles of a metallic element which comprises irradiating a compound of the metallic element in a vapor phase containing at least 1×10 15 molecules of the compound per cm 3 with rays of a laser beam having an energy density of at least 1×10 -3 Joule per cm 2 .
Claim 3
Dependent Claim
33 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 1 wherein the compound of the metallic element is an organic compound of the metallic element.
Claim 4
Dependent Claim
37 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 1 wherein the compound of the metallic element is selected from the group consisting of tetraalkyl leads and trialkyl bismuths.
Claim 5
Dependent Claim
35 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 1 wherein the vapor phase contains at least 1×10 16 molecules of the compound per cm 3 .
Claim 6
Dependent Claim
35 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 1 wherein the vapor phase contains at least 1×10 17 molecules of the compound per cm 3 .
Claim 7
Dependent Claim
39 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 1 wherein the vapor phase of the metallic compound is diluted with up to an equal concentration of an inert diluent gas.
Claim 8
Dependent Claim
35 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 6 wherein the diluent gas is selected from the group consisting of helium, argon, nitrogen, hydrogen and air.
Claim 9
Dependent Claim
39 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 2 wherein the vapor phase of the metallic compound is diluted with up to an equal concentration of an inert diluent gas.
Claim 10
Dependent Claim
35 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 8 wherein the diluent gas is selected from the group consisting of helium, argon, nitrogen, hydrogen and air.
Claim 11
Dependent Claim
39 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 3 wherein the vapor phase of the metallic compound is diluted with up to an equal concentration of an inert diluent gas.
Claim 12
Dependent Claim
35 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 10 wherein the diluent gas is selected from the group consisting of helium, argon, nitrogen, hydrogen and air.
Claim 13
Dependent Claim
39 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 4 wherein the vapor phase of the metallic compound is diluted with up to an equal concentration of an inert diluent gas.
Claim 14
Dependent Claim
35 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 12 wherein the diluent gas is selected from the group consisting of helium, argon, nitrogen, hydrogen and air.
Claim 15
Dependent Claim
39 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 5 wherein the vapor phase of the metallic compound is diluted with up to an equal concentration of an inert diluent gas.
Claim 16
Dependent Claim
35 words
The method for the preparation of finely divided particles of a metallic element as claimed in claim 14 wherein the diluent gas is selected from the group consisting of helium, argon, nitrogen, hydrogen and air.
References Cited (Backward Citations)
US4472513A
Cited
US4474604A
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US4482375A
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US4571331A
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US4571331B1
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US4619691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |