US4457256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precharged web coating apparatus
Assignee: Polaroid Corp
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Filing: 1981-01-05
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Granted: 1984-07-03
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Expires: 2001-01-05
Abstract
Abstract Improved electrostatically assisted coating apparatus for placing an electrostatic dipole-type charge, of a predetermined magnitude, on material to be coated before and/or remote from the location where the coating is actually applied to said material by a coating applicator.
Inventors
- 👤 Semyon Kisler
- 👤 Edwin A. Chirokas
- 👤 Donald A. Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:32
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/74; B; B05; B05D; B05D3/00; B05D3/14; G03C1/76; G03C1/91; G03C1/915
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
109 words
Electric coating-gap assist apparatus comprising: support means for supporting charge-retaining material having a predetermined dipole-type electrostatic charge for producing a corresponding electrical potential; and a coating applicator for applying coating material to said charge-retaining material, said coating applicator being mounted in spaced relation to said support means and including means for providing an electrical potential different from said predetermined charge potential, so as to produce an electric field between said charge-retaining material on said support and said applicator by virtue of the proximity of said dipole-type electrostatic charge of said charge-retaining material to said different potential applicator, to thereby assist in depositing said coating material on said charge-retaining material.
Claim 2
Dependent Claim
109 words
Electric coating-gap assist apparatus comprising: support means for supporting charge-retaining material having a predetermined dipole-type electrostatic charge for producing a corresponding electrical potential; and a coating applicator for applying coating material to said charge-retaining material, said coating applicator being mounted in spaced relation to said support means and including means for providing an electrical potential different from said predetermined charge potential, so as to produce an electric field between said charge-retaining material on said support and said applicator by virtue of the proximity of said dipole-type electrostatic charge of said charge-retaining material to said different potential applicator, to thereby assist in depositing said coating material on said charge-retaining material.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 wherein said support means supports said charge-retaining material for advancement across said support means.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 including means for providing said predetermined charge on said charge-retaining material.
Claim 5
Dependent Claim
157 words
Improved electrostatic coating-gap assist apparatus, comprising: charge-retaining material to be coated having a predetermined dipole-type electrostatic charge thereon producing a corresponding electrical potential; an electrically conductive reference member having an electrical potential that is different from the said potential of said charge-retaining material; a coating applicator for applying coating material to said charge-retaining material; and means for movably supporting portions of said charge-retaining material in a spaced relation from said applicator and from said reference member to form a coating gap between said charge-retaining material portions and said applicator to thereby produce an electrostatic field between said charge-retaining material portions and said reference member by virtue of the proximity of said dipole-type electrostatic charge of said charge-retaining material to said different potential electrically conductive reference member that will cause coating material from said applicator to be uniformly deposited on said charge-retaining material as said material portions are moved into proximity with said applicator and said reference member.
Claim 6
Dependent Claim
157 words
Improved electrostatic coating-gap assist apparatus, comprising: charge-retaining material to be coated having a predetermined dipole-type electrostatic charge thereon producing a corresponding electrical potential; an electrically conductive reference member having an electrical potential that is different from the said potential of said charge-retaining material; a coating applicator for applying coating material to said charge-retaining material; and means for movably supporting portions of said charge-retaining material in a spaced relation from said applicator and from said reference member to form a coating gap between said charge-retaining material portions and said applicator to thereby produce an electrostatic field between said charge-retaining material portions and said reference member by virtue of the proximity of said dipole-type electrostatic charge of said charge-retaining material to said different potential electrically conductive reference member that will cause coating material from said applicator to be uniformly deposited on said charge-retaining material as said material portions are moved into proximity with said applicator and said reference member.
Claim 7
Dependent Claim
22 words
The apparatus of claim 4, wherein said electrically conductive reference member and said coating applicator are formed of the same physical structure.
Claim 8
Dependent Claim
148 words
Improved electrostatic coating-gap assist apparatus, comprising: charge-retaining material to be coated having a predetermined electrostatic dipole-type charge thereon for producing a corresponding electrical potential; an electrically conductive coating applicator, having an electrical potential that is different from the said potential of said charge-retaining material, for applying coating material to said charge-retaining material; and means for movably supporting portions of said charge-retaining material in a spaced relation from said applicator to form a coating gap between said charge-retaining material portions and said applicator to thereby produce an electrostatic field between said charge-retaining material portions and said applicator by virtue of the proximity of said dipole-type electrostatic charge of said charge-retaining material to said different potential electrically conductive coating applicator that will cause coating material from said applicator to be uniformly deposited on said charge-retaining material as said material portions are moved into proximity with said electrically conductive coating applicator.
Claim 9
Dependent Claim
148 words
Improved electrostatic coating-gap assist apparatus, comprising: charge-retaining material to be coated having a predetermined electrostatic dipole-type charge thereon for producing a corresponding electrical potential; an electrically conductive coating applicator, having an electrical potential that is different from the said potential of said charge-retaining material, for applying coating material to said charge-retaining material; and means for movably supporting portions of said charge-retaining material in a spaced relation from said applicator to form a coating gap between said charge-retaining material portions and said applicator to thereby produce an electrostatic field between said charge-retaining material portions and said applicator by virtue of the proximity of said dipole-type electrostatic charge of said charge-retaining material to said different potential electrically conductive coating applicator that will cause coating material from said applicator to be uniformly deposited on said charge-retaining material as said material portions are moved into proximity with said electrically conductive coating applicator.
Claim 10
Independent Claim
27 words
The apparatus of claims 4 or 6, wherein said electrical potential on said charge-retaining material is less than a magnitude that is necessary to produce a corona.
Claim 11
Independent Claim
21 words
The apparatus of claims 4 or 6, wherein the electrostatic charge on said charge-retaining material is established with a corona field.
Claim 12
Independent Claim
27 words
The apparatus of claims 4 or 6, wherein the electrostatic charge on said charge-retaining material is established with an electrostatic field produced with a conductive bristle brush.
Claim 13
Independent Claim
30 words
The apparatus of claims 4 or 6, wherein the electrical potential of said material to be coated is more positive than the electrical potential of said electrically conductive reference member.
Claim 14
Independent Claim
30 words
The apparatus of claims 4 or 6, wherein the electrical potential of said material to be coated is more negative than the electrical potential of said electrically conductive reference member.
Claim 15
Independent Claim
15 words
The apparatus of claims 4 or 6, wherein said electric field is an electrostatic field.
Claim 16
Independent Claim
14 words
The apparatus of claims 4 or 6, wherein said coating material is a fluid.
Claim 17
Independent Claim
14 words
The apparatus of claims 4 or 6, wherein said coating material is a slurry.
Claim 18
Independent Claim
14 words
The apparatus of claims 4 or 6, wherein said coating material is a dispersion.
Claim 19
Independent Claim
14 words
The apparatus of claims 4 or 6, wherein said coating material is an emulsion.
References Cited (Backward Citations)
US2774921A
Cited
US3196270A
Cited
US3474292A
Cited
US3702258A
Cited
US3671806A
Cited
US3707138A
Cited
US4086872A
Cited
US4088093A
Cited
US4402035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |