US3853581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating articles with electrostatically charged particles
Assignee: Air Industrie SA
•
Filing: 1972-06-02
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Granted: 1974-12-10
•
Expires: 1992-06-02
Abstract
Abstract A method of coating articles with electrostatically charged particles by passing said articles through a chamber while supplying the chamber with solid organic particles as rapidly as the particles leave the chamber on said articles, while maintaining an inert gaseous atmosphere within the chamber, using means within the chamber to fluidize said particles, and then melting the particles deposited upon the articles.
Inventors
- 👤 P Fabre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:47
CPC Classifications
B; B05; B05C; B05C19/00; B05C19/02; B05C19/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A METHOD OF COATING ARTICLES WITH ELECTROSTATICALLY CHARGED PARTICLES COMPRISING THE STEPS OF MAINTAINING AN INERT GASEOUS ATMOSPHERE WITHIN A CHAMBER, SAID ATMOSPHERE BEING UNDER A PRESSURE AT LEAST AS GREAT AS THE AMBIENT ATMOSPHERIC PRESSURE, INTRODUCING SOLID ORGANIC PARTICLES INTO SAID CHAMBER, FROMING A SUSPENSION OF SAID PARTICLES WITHIN SAID CHAMBER BY CONTINUOUSLY CIRCULATING AND AGITATING SAID GASEOUS ATMOSPHERE AND SAID PARTICLES, ELECTROSTATICALLY CHARGING SAID PARTICLES IN SAID SUSPENSION, PASSING ARTICLES THROUGH SAID CHAMBER, DEPOSITING SAID CHARGED PARTICLES UPON SAID ARTICLES TO FROM A LAYER OF CHARGED PARTICLES ON SAID ARTICLES, WITHDRAWING SAID PARTICLE-COATED ARTICLES FROM SAID CHAMBER WHILE SUPPLYING ADDITIONAL SOLID ORGANIC PARTICLES TO SAID CHAMBER AT A RATE EQUAL TO THAT AT WHICH THE COATED ARTICLES LEAVE SAID CHAMBER, AND HEATING THE PARTICLE-COATED ARTICLES TO MELT SAID PARTICLE LAYER TO FORM A THIN CONTAINUOUS COATING ON SAID ARTICLES.
Claim 2
Independent Claim
141 words
A METHOD OF COATING ARTICLES WITH ELECTROSTATICALLY CHARGED PARTICLES COMPRISING THE STEPS OF MAINTAINING AN INERT GASEOUS ATMOSPHERE WITHIN A CHAMBER, SAID ATMOSPHERE BEING UNDER A PRESSURE AT LEAST AS GREAT AS THE AMBIENT ATMOSPHERIC PRESSURE, INTRODUCING SOLID ORGANIC PARTICLES INTO SAID CHAMBER, FROMING A SUSPENSION OF SAID PARTICLES WITHIN SAID CHAMBER BY CONTINUOUSLY CIRCULATING AND AGITATING SAID GASEOUS ATMOSPHERE AND SAID PARTICLES, ELECTROSTATICALLY CHARGING SAID PARTICLES IN SAID SUSPENSION, PASSING ARTICLES THROUGH SAID CHAMBER, DEPOSITING SAID CHARGED PARTICLES UPON SAID ARTICLES TO FROM A LAYER OF CHARGED PARTICLES ON SAID ARTICLES, WITHDRAWING SAID PARTICLE-COATED ARTICLES FROM SAID CHAMBER WHILE SUPPLYING ADDITIONAL SOLID ORGANIC PARTICLES TO SAID CHAMBER AT A RATE EQUAL TO THAT AT WHICH THE COATED ARTICLES LEAVE SAID CHAMBER, AND HEATING THE PARTICLE-COATED ARTICLES TO MELT SAID PARTICLE LAYER TO FORM A THIN CONTAINUOUS COATING ON SAID ARTICLES.
Claim 3
Dependent Claim
37 words
A method as claimed in claim 1 comprising the further step of introducing said articles into said chamber and removing them from said chamber through locks designed to inhibit the escape of gas-borne particles from said chamber.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1 in which said chamber is maintained at a pressure greater than the ambient atmospheric pressure.
Claim 5
Dependent Claim
47 words
A method as claimed in claim 1 which further comprises the steps of providing a plurality of spaced electrically charged points in said chamber for electrostatically charging said particles and maintaining said articles in electrical contact with an oppositely charged conductor as they pass through said chamber.
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |