US3630442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic coating method and apparatus
Assignee: Randburg Electro-Coating Corp
•
Filing: 1969-06-16
•
Granted: 1971-12-28
•
Expires: 1989-06-16
Abstract
Abstract A method and apparatus for electrostatically applying solid particles to an article employs a nozzle forming the solid particles into a pattern and directing them at the article, preferably in a relatively flat, fanlike spray. The forward portion of the nozzle is formed of insulating material and includes an ionizing electrode. An electrostatic field is established between the article and an electrode that creates a single highly ionized zone offset from and rearwardly of the spray. The percentage of solid particles which are sprayed but remain undeposited is reduced using this method and apparatus.
Inventors
- 👤 Richard O Probst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:26
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/025; B05B5/03; B05B5/032
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
An apparatus for electrostatically depositing entrained solid particles on an article at a particle attracting potential comprising, means including a passageway for conveying entrained particles adapted to be connected to a source of entrained solid particles, nozzle means of nonconducting material connected to the passageway, the nozzle means to form the solid particle into a spray pattern issuing from an orifice and direct the solid particles at the article, and a single elongated electrode having a tip located offset from and rearwardly of the orifice.
Claim 2
Independent Claim
85 words
An apparatus for electrostatically depositing entrained solid particles on an article at a particle attracting potential comprising, means including a passageway for conveying entrained particles adapted to be connected to a source of entrained solid particles, nozzle means of nonconducting material connected to the passageway, the nozzle means to form the solid particle into a spray pattern issuing from an orifice and direct the solid particles at the article, and a single elongated electrode having a tip located offset from and rearwardly of the orifice.
Claim 3
Dependent Claim
110 words
A pattern-forming and electrostatic-charging structure for an apparatus for electrostatically depositing entrained solid particles comprising, means including a passageway for conveying entrained solid particles adapted to be connected to a source of entrained solid particles, a body of nonconducting material having an elongated orifice at its forward end and a bore within the body defined by walls that converge at the orifice, the bore of the body connected to the passageway, means carried by the body within the bore including a surface protruding into the bore rearwardly of the orifice, and an elongated wirelike electrode carried by the body with its forwardmost tip offset from and rearwardly of the orifice.
Claim 4
Dependent Claim
110 words
A pattern-forming and electrostatic-charging structure for an apparatus for electrostatically depositing entrained solid particles comprising, means including a passageway for conveying entrained solid particles adapted to be connected to a source of entrained solid particles, a body of nonconducting material having an elongated orifice at its forward end and a bore within the body defined by walls that converge at the orifice, the bore of the body connected to the passageway, means carried by the body within the bore including a surface protruding into the bore rearwardly of the orifice, and an elongated wirelike electrode carried by the body with its forwardmost tip offset from and rearwardly of the orifice.
Claim 5
Dependent Claim
78 words
The pattern-forming and electrostatic charging structure of claim 5 wherein the walls that converge at the orifice are hemispherical in form, the elongated orifice is formed at the intersection of the walls and a V-shaped groove in the forward end of the body, the means carried by the body is a pin extending into the bore, and the tip of the wirelike electrode offset from the orifice about one-half inch and rearwardly of the orifice about one-half inch.
Claim 6
Dependent Claim
27 words
The structure of claim 2, wherein the body carries a conductive plastic ring in its rear surface in contact with the rear end of the elongated wire.
Claim 7
Independent Claim
126 words
An apparatus for electrostatically charging and depositing a spray of solid particles entrained in a gas on an article at a particle attracting potential comprising, means including a barrel of nonconductive material including a passageway adapted to be connected to a source of entrained solid particles in gas, a body of nonconductive material connected to the passageway of the barrel, the body including an orifice for forming the solid particles into a spray pattern, and an elongated charged electrode adjacent the body, the forwardmost tip of the electrode offset from and rearwardly of the orifice establishing an electrostatic field between the article and the electrode and a single highly ionized zone offset from and rearwardly of the spray to charge the solid particles of the spray.
Claim 8
Independent Claim
126 words
An apparatus for electrostatically charging and depositing a spray of solid particles entrained in a gas on an article at a particle attracting potential comprising, means including a barrel of nonconductive material including a passageway adapted to be connected to a source of entrained solid particles in gas, a body of nonconductive material connected to the passageway of the barrel, the body including an orifice for forming the solid particles into a spray pattern, and an elongated charged electrode adjacent the body, the forwardmost tip of the electrode offset from and rearwardly of the orifice establishing an electrostatic field between the article and the electrode and a single highly ionized zone offset from and rearwardly of the spray to charge the solid particles of the spray.
Claim 9
Dependent Claim
41 words
The apparatus for electrostatically charging and depositing a spray of solid particles entrained in gas as claimed in claim 5, wherein the body includes means for forming the solid particles into a spray pattern having solid particles substantially uniformly distributed therein.
Claim 10
Dependent Claim
59 words
The apparatus for electrostatically charging and depositing a sPray of solid particles entrained in a gas as claimed in claim 5, wherein the orifice is elongated and the tip of the electrode is laterally offset from and rearwardly of the orifice in a direction substantially perpendicular to the common plane of the elongated orifice and the spray emitted therefrom.
References Cited (Backward Citations)
FR59514E
Cited
US2995393A
Cited
US3263127A
Cited
US3248606A
Cited
US3279429A
Cited
US3268171A
Cited
US3195264A
Cited
US3327948A
Cited
GB1125446A
Cited
US3393662A
Cited
GB1151079A
Cited
US3463395A
Cited
US3408985A
Cited
US3498541A
Cited
US3476319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |