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US3771996A
Expired / Lapsed
US
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Process for manufacturing gold powder
Assignee: EIDP Inc
•
Filing: 1971-10-26
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Granted: 1973-11-13
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Expires: 1991-10-26
Abstract
Abstract A process for preparing a gold powder having spherical particles with a particle diameter within the range of 1-10 microns wherein the powder has a bulk density within the range of 5-9 gms./cc. by precipitating the gold from solution with selected reducing agents under controlled conditions. Metallizing compositions made from this novel gold fired to very high density prints which have good appearance and electrical properties.
Inventors
- 👤 O Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:11
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24; B22F1/00; B22F1/06; B22F1/065; C; C22; C22B; C22B11/00; C22B11/04; Y; Y10; Y10S; Y10S75/00; Y10S75/953
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
A process in accordance with claim 1 wherein the reducing agent is potassium sulfite.
Claim 2
Dependent Claim
21 words
A process in accordance with claim 1 wherein the precipitated gold powder is washed first with water and secondly, with methanol.
Claim 3
Dependent Claim
20 words
A process in accordance with claim 1 wherein the temperature in the precipitating step is within the range of 10*-20*C.
Claim 4
Dependent Claim
22 words
A process in accordance with claim 1 wherein the particle size of the gold powder is within the range of 2-6 microns.
Claim 5
Dependent Claim
37 words
A process in accordance with claim 1 wherein, prior to the precipitating step, the aqueous gold chloride solution contains 40-70 gms/liter of gold and the reducing agent is in a solution containing 100-200 gms/liter of said agent.
References Cited (Backward Citations)
US3427153A
Cited
US3620714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |