US4810285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing spherical copper fine powder
Assignee: JFE Steel Corp
•
Filing: 1988-03-18
•
Granted: 1989-03-07
•
Expires: 2008-03-18
Abstract
Abstract In a process for preparing a spherical copper fine powder having an average grain size ranging from 0.1 μm to a few μm, by use of chemical vapor deposition of cuprous chloride vapor with a reducing gas, the vapor deposition zone is maintained at a temperature ranging 900° C. to less than 1,150° C. and the generated particles are quenched subsequently. The generated powder is utilized as a conductive powder which is the main component of a conductive paste.
Inventors
- 👤 Kenichi Otsuka
- 👤 Minoru Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:04
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/28; H; H01; H01B; H01B1/00; H01B1/02; Y; Y10; Y10S; Y10S75/00; Y10S75/953
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A process of making fine, spherical copper powder comprising the steps of introducing a gaseous mixture of a reducible copper compound and an inert gas into a vapor deposition zone to contact a reducing gas; maintaining the zone at a temperature ranging from 900° C. to less than 1150° C. to generate fine, spherical copper particles; quenching the generated particles.
Claim 2
Dependent Claim
60 words
A process of making fine, spherical copper powder comprising the steps of introducing a gaseous mixture of a reducible copper compound and an inert gas into a vapor deposition zone to contact a reducing gas; maintaining the zone at a temperature ranging from 900° C. to less than 1150° C. to generate fine, spherical copper particles; quenching the generated particles.
Claim 3
Dependent Claim
42 words
A process claimed in claim 1 which further comprises determining a combination of an evaporation temperature of cuprous chloride and a flow rate of the inert gas for obtaining an average grain size ranging from 0.1 μm to a few μm .
Claim 4
Dependent Claim
31 words
A process claimed in claim 1 which comprises quenching the generated particles at a rate of more than 1500 deg/sec, whereby the particles remain as a generated state of spherical shape.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |