Patent US3700168A successfully refreshed from Google Patents.
US3700168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray coating apparatus
Assignee: Ransburg Corp
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Filing: 1970-11-09
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Granted: 1972-10-24
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Expires: 1990-11-09
Abstract
Abstract An electrostatic, compressed-air spray gun wherein the liquid to be atomized is formed on a conductive support into a film having an extended edge coincident with one edge of a narrow opening through which a high-velocity stream of atomizing air is discharged. The opposite edge of such opening is defined by an electrode between which and the film-support there is maintained an electrical potential difference. The gun may be provided with an insulated spray-surrounding electrode which is maintained at an effective spray-repelling potential by the transmission of ion-borne charges to or from it.
Inventors
- 👤 Wolfgang Ferrant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:06
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/025; B05B5/03; B05B7/00; B05B7/02; B05B7/06; B05B7/062; B05B7/066; B05B7/067
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A method of providing a spray of electrically charged liquid particles comprising providing first and second adjacent elements which cooperate to form an opening and direct a high velocity stream of air, providing a liquid film edge in the opening and carried by one of the elements, the liquid film edge being spaced from the other element, establishing a potential difference between the elements creating an electric field across the opening to electrically charge the liquid film edge, and sweeping the elements with the high velocity stream of air directed by the elements to atomize the liquid from the film edge on one element into a spray of electrically charged liquid particles carried away from the elements and through the opening.
Claim 2
Independent Claim
121 words
A method of providing a spray of electrically charged liquid particles comprising providing first and second adjacent elements which cooperate to form an opening and direct a high velocity stream of air, providing a liquid film edge in the opening and carried by one of the elements, the liquid film edge being spaced from the other element, establishing a potential difference between the elements creating an electric field across the opening to electrically charge the liquid film edge, and sweeping the elements with the high velocity stream of air directed by the elements to atomize the liquid from the film edge on one element into a spray of electrically charged liquid particles carried away from the elements and through the opening.
Claim 3
Independent Claim
93 words
A method of electrostatic coating an article comprising forming a liquid into film having an edge on a supporting element, creating en electric field having high potential gradient at the edge of the film by positioning a field creating element adjacent the edge of the film, and using the field creating element and the film supporting element to direct a high velocity stream of air transversely of the liquid film edge to atomize the liquid into a charged liquid spray and project it away from the elements toward the article to be coated.
Claim 4
Independent Claim
93 words
A method of electrostatic coating an article comprising forming a liquid into film having an edge on a supporting element, creating en electric field having high potential gradient at the edge of the film by positioning a field creating element adjacent the edge of the film, and using the field creating element and the film supporting element to direct a high velocity stream of air transversely of the liquid film edge to atomize the liquid into a charged liquid spray and project it away from the elements toward the article to be coated.
Claim 5
Dependent Claim
25 words
The method of claim 1, wherein the potential difference between the element is established by connecting the elements to different terminals of a voltage source.
Claim 6
Dependent Claim
21 words
The method of claim 3, wherein element carrying the liquid film is connected to the ground terminal of the voltage source.
Claim 7
Dependent Claim
45 words
The method of claim 1 including the further step of introducing additional amounts of air to the spray of charged liquid particles to minimize the tendency of the charged liquid particles to spread under the influence of electrostatic forces acting between the charged liquid particles.
Claim 8
Dependent Claim
14 words
The method of claim 5, wherein the additional amount of air is aspirated air.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |