US4093755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a liquid heat exchanger coating
Assignee: Gates Corp
•
Filing: 1976-07-26
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Granted: 1978-06-06
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Expires: 1996-07-26
Abstract
Abstract Flame spraying a plurality of particles of oxide film forming metal on a substrate and randomly attaching a plurality of particles to a substrate and to portions of each other, the unconnected portions between particles forming porously interconnected open cell nucleation sites capable of aiding change of state from a liquid to a gas.
Inventors
- 👤 Michael M. Dahl
- 👤 Lester D. Erb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:24
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12118; Y10T428/12125; Y10T428/12153; Y10T428/12292; Y10T428/12299; Y10T428/12472; Y10T428/12479; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24413; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/24997; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A method for making a liquid heat exchanger coating comprising the steps of: heating a plurality of powder particles of oxide film forming metal in an oxygen rich atmosphere and forming a metallic oxide film on the particles; moving the particles with a stream of oxygen rich gas while simultaneously heating a plurality of the particles to at least a plastic state and some of the particles to a molten state; impacting a plurality of the particles against a metallic substrate and against themselves partially deforming, securing and mechanically interlocking a plurality of the particles to the substrate and to portions of each other, breaking the oxide film and fusing some of the molten particles to portions of each other and forming unconnected portions between a plurality of particles that define a plurality of open nucleation cells and the unconnected portions also forming porous interconnections between nucleation cells.
Claim 2
Independent Claim
148 words
A method for making a liquid heat exchanger coating comprising the steps of: heating a plurality of powder particles of oxide film forming metal in an oxygen rich atmosphere and forming a metallic oxide film on the particles; moving the particles with a stream of oxygen rich gas while simultaneously heating a plurality of the particles to at least a plastic state and some of the particles to a molten state; impacting a plurality of the particles against a metallic substrate and against themselves partially deforming, securing and mechanically interlocking a plurality of the particles to the substrate and to portions of each other, breaking the oxide film and fusing some of the molten particles to portions of each other and forming unconnected portions between a plurality of particles that define a plurality of open nucleation cells and the unconnected portions also forming porous interconnections between nucleation cells.
Claim 3
Dependent Claim
40 words
The method of claim 1 comprising burning generally 17 cubic feet per hour of acetylene with generally 38.5 cubic feet per hour of oxygen with air aspiration to constitute the steps of heating the particles and forming an oxide film.
Claim 4
Dependent Claim
22 words
The method of claim 1 and further including the step of roughening the substrate prior to the step of heating the particles.
Claim 5
Dependent Claim
19 words
The method of claim 2 wherein during the step of moving, the particles travel generally 12 inches before impacting.
Claim 6
Dependent Claim
16 words
The method of claim 2 wherein the particles are aluminum of about -170 to +325 mesh.
Claim 7
Dependent Claim
28 words
The method of claim 5 which further comprises during the step of moving, the step of flowing the powder at a rate of about 3.75 pound per hour.
Claim 8
Dependent Claim
29 words
The process as set forth in claim 1 wherein during the step of heating, the powdered metal particles are exposed to an oxygen-rich atmosphere in which carbon is present.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |