US3798048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for electrostatically coating an object
Assignee: Nyvel Corp
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Filing: 1971-07-27
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Granted: 1974-03-19
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Expires: 1991-07-27
Abstract
Abstract An apparatus and method for electrostatically applying a plurality of particles such as flock to an object. The particles are placed into a hopper at an uppermost portion of the apparatus and are propelled downwardly through a metallic screen to which an unchanging electrical charge is applied. The particles are given a predetermined orientation and continue their downward passage through a metallic grid to which a changing electrical charge is applied. In another embodiment, the flock is propelled in an upward direction through changing and unchanging electrically charged zones. The particles attach themselves to the object in a uniformly dense manner and substantially align themselves in accordance with the electrostatic lines of force.
Inventors
- 👤 A Brody
- 👤 E Lipkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:46
CPC Classifications
B; B05; B05C; B05C19/00; B05C19/001; B05C19/002; B05D; B05D1/00; B05D1/16; B05D1/007
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
An apparatus as defined in claim 1 wherein said object supporting means is below said supply means.
Claim 2
Dependent Claim
58 words
An apparatus as defined in claim 1 wherein said first and second means comprise electrically conductive members with openings therein, and said openings are large enough to permit substantially unimpeded passage of said particles therethrough, said first means being coupled to a source of direct current and said second means being coupled to a source of alternating current.
Claim 3
Dependent Claim
17 words
An apparatus as defined in claim 1 wherein said object supporting means is above said supply means.
Claim 4
Dependent Claim
58 words
An apparatus as defined in claim 4 wherein said first and second means comprise electrically conductive members with openings therein, and said openings are large enough to permit substantially unimpeded passage of said particles therethrough, said first means being coupled to a source of alternating current and said second means being coupled to a source of direct current.
Claim 5
Independent Claim
98 words
A method for applying a plurality of flock particles to an object comprising the steps of providing a supply of flock particles and an object to which said flock particles are to be applied, applying a changing electric field to said flock particles between said supply and said object, and applying an unchanging electric field to said flock particles between said changing electric field and said supply so that some of said flock particles are repelled by said unchanging electric field and the remainder of said flock particles are driven by said changing electric field to said object.
Claim 6
Dependent Claim
33 words
A method as defined in claim 6 wherein said unchanging electric field is achieved by applying a direct current thereto and said changing electric field is achieved by applying an alternating current thereto.
Claim 7
Dependent Claim
32 words
A method as defined in claim 6 including the step of positioning said supply and said object so that said particles are transported primarily in the direction of the force of gravity.
Claim 8
Dependent Claim
32 words
A method as defined in claim 6 including the step of positioning said supply and said object so that said particles are transported primarily in a direction against the force of gravity.
Claim 9
Dependent Claim
32 words
A method as defined in claim 6 including the step of varying the density of said flock particles in said changing electric field by regulating the strength of said unchanging electrical field.
References Cited (Backward Citations)
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |