Patent US4853250A successfully refreshed from Google Patents.
US4853250A
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US
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Process of depositing particulate material on a substrate
Assignee: Université de Sherbrooke
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Filing: 1988-05-11
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Granted: 1989-08-01
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Expires: 2008-05-11
Abstract
Abstract The invention relates to a process and an apparatus for the plasma deposition of protective coatings and near net shape bodies using induction plasma technology. The apparatus comprises an induction plasma torch in which the particulate material to be deposited is accelerated and injected axially into the discharge. As the particles traverse the plasma they are heated and melted before being deposited by impaction on the substrate placed at the downstream end of the plasma torch facing the plasma jet.
Inventors
- 👤 Maher Boulos
- 👤 Jerzy Jurewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:32
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/12; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A process for heating and depositing a particulate material on a substrate, said process comprising the steps of: flowing ionizable plasma gas at a certain velocity in a plasma container along a longitudinal axis thereof; inductively coupling energy to said plasma gas to create in said plasma container a body of plasma directed toward said substrate; accelerating particulate material to be deposited on said substrate to a velocity higher than the velocity of said plasma gas flowing in said plasma container; and feeding said particulate material in said plasma container along a longitudinal axis thereof, wherein said particulate material is heated while passing in said body of plasma at a velocity higher than the velocity of said plasma gas and is deposited on said substrate.
Claim 2
Dependent Claim
125 words
A process for heating and depositing a particulate material on a substrate, said process comprising the steps of: flowing ionizable plasma gas at a certain velocity in a plasma container along a longitudinal axis thereof; inductively coupling energy to said plasma gas to create in said plasma container a body of plasma directed toward said substrate; accelerating particulate material to be deposited on said substrate to a velocity higher than the velocity of said plasma gas flowing in said plasma container; and feeding said particulate material in said plasma container along a longitudinal axis thereof, wherein said particulate material is heated while passing in said body of plasma at a velocity higher than the velocity of said plasma gas and is deposited on said substrate.
Claim 3
Dependent Claim
25 words
A process as defined in claim 1, wherein said particulate material is accelerated to a velocity substantially higher than the velocity of said plasma gas.
Claim 4
Dependent Claim
35 words
A process as defined in claim 1, comprising the step of accelerating said particulate material through viscous drag with a carrier gas and injecting said particulate material and said carrier gas in said plasma container.
Claim 5
Dependent Claim
27 words
A process as defined in claim 1, further comprising the step of reducing the velocity of said carrier gas prior the injection thereof in said plasma container.
Claim 6
Dependent Claim
25 words
A process as defined in claim 4, comprising the step of expanding in volume said carrier gas prior the injection thereof in said plasma container.
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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |