Patent US4685620A successfully refreshed from Google Patents.
US4685620A
Expired / Lapsed
US
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Low-volume electrostatic spraying
Assignee: North Carolina State University
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Filing: 1985-09-30
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Granted: 1987-08-11
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Expires: 2005-09-30
Abstract
Abstract A method for increasing the efficiency of electrostatic deposition of particulate matter on a surface, which comprises preparing a dispersion of electrostatically charged particles of an active material to be deposited on the surface, wherein the particles of active material have an average radius of rp1 and a total volume of VL1, in a space adjacent to the surface which contains a dispersion of particles of an inert material, electrostatically charged with the same polarity as said particles of active material, wherein the particles of inert material have an average radius of rp2 and a total volume of VL2, wherein rp1>rp2 and <IMAGE>
Inventors
- 👤 S. Edward Law
- 👤 Henry D. Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:21
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/02; B05D1/04; A; A01; A01N; A01N25/00; A01N25/02; A01N25/04; A01N25/06; B05B; B05B5/00; B05B5/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A method for increasing the efficiency of electrostatic deposition of particulate matter on a surface, which comprises: preparing a dispersion of electrostatically charged particles of an active material to be deposited on said surface, wherein said particles of active material have an average radius of r p1 and a total volume of V L1 , in a space adjacent to said surface which contains a dispersion of particles of an inert material, electrostatically charged with the same polarity as said particles of active material, wherein said particles of inert material have an average radius of r p2 and a total volume of V L2 , wherein r p1 >r p2 and ##STR3##
Claim 2
Independent Claim
112 words
A method for increasing the efficiency of electrostatic deposition of particulate matter on a surface, which comprises: preparing a dispersion of electrostatically charged particles of an active material to be deposited on said surface, wherein said particles of active material have an average radius of r p1 and a total volume of V L1 , in a space adjacent to said surface which contains a dispersion of particles of an inert material, electrostatically charged with the same polarity as said particles of active material, wherein said particles of inert material have an average radius of r p2 and a total volume of V L2 , wherein r p1 >r p2 and ##STR3##
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein r p1 ≧2r p2 .
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein r p1 ≧5r p2 .
Claim 5
Dependent Claim
7 words
The method of claim 3, wherein ##EQU20##
Claim 6
Dependent Claim
7 words
The method of claim 1, wherein ##EQU21##
Claim 7
Dependent Claim
7 words
The method of claim 1, wherein ##EQU22##
Claim 8
Dependent Claim
11 words
The method of claim 6, wherein r p1 ≧5r p2 .
Claim 9
Dependent Claim
12 words
The method of claim 1, wherein the active material comprises a paint.
Claim 10
Dependent Claim
13 words
The method of claim 8, wherein the inert material comprises a paint thinner.
Claim 11
Dependent Claim
25 words
The method of claim 1, wherein the active material is a particulate impurity in a gaseous stream and said surface is an impurity collecting area.
Claim 12
Dependent Claim
21 words
The method of claim 1, wherein the active material is a pesticide or herbicide and said surface is a plant surface.
References Cited (Backward Citations)
US4168327A
Cited
US4565318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |