US3652259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical powders
Assignee: Olin Corp
•
Filing: 1968-05-14
•
Granted: 1972-03-28
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Expires: 1988-05-14
Abstract
Abstract The instant disclosure teaches an improved process for obtaining dense, spherical, metal particles characterized by coating the starting material with a weld-preventing material and heating the coated particles in a protective atmosphere.
Inventors
- 👤 Walter V Knopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:20
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/06; B22F1/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
15 words
A process according to claim 1 wherein said particles are copper or copper base alloys.
Claim 2
Dependent Claim
34 words
A process according to claim 1 wherein the starting material metallic particles in step (A) are obtained by sintering a plurality of metal particles to form a cake and mechanically breaking up said cake.
Claim 3
Dependent Claim
20 words
A process according to claim 3 wherein the particles which are sintered have a particle size smaller than 100 mesh.
Claim 4
Dependent Claim
31 words
A process according to claim 1 wherein the starting material metallic particles in step (A) are obtained by disintegrating a stream of molten metal by impinging said stream with a fluid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |