US4513683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating uniformity improvement apparatus
Assignee: Polaroid Corp
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Filing: 1983-04-04
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Granted: 1985-04-30
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Expires: 2003-04-04
Abstract
Abstract Apparatus for improving the uniformity of a wet coating applied on a charge-retaining base material, said apparatus comprising charging means for producing an electric field between said coating and said base material while said coating remains in an essentially wet state.
Inventors
- 👤 Semyon Kisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:31
CPC Classifications
B; B05; B05C; B05C11/00; B05C11/02; B05C11/023; B05D; B05D3/00; B05D3/14; G; G03; G03C; G03C1/00; G03C1/74; G03C1/76; G03C1/91; G03C1/915
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
Coating apparatus comprising: means for depositing a wet coating on one surface of a web of charge-retaining material as it is advanced along a given path, said web having a residual charge following said coating deposition; and means spaced downstream of said depositing means, at a point wherein said coating still remains wet, for altering said residual charge of said web to enhance redistribution of the still wet coating and thereby improve its uniformity.
Claim 2
Dependent Claim
74 words
Coating apparatus comprising: means for depositing a wet coating on one surface of a web of charge-retaining material as it is advanced along a given path, said web having a residual charge following said coating deposition; and means spaced downstream of said depositing means, at a point wherein said coating still remains wet, for altering said residual charge of said web to enhance redistribution of the still wet coating and thereby improve its uniformity.
Claim 3
Dependent Claim
44 words
The invention of claim 1 wherein said means for altering said residual charge includes an electrode mounted at said point downstream in adjoining relation to the opposite surface of said web, and means for applying an electric field between said electrode and said coating.
Claim 4
Dependent Claim
62 words
The invention of claim 2 wherein said depositing means includes dipole charging of said web prior to or during deposit of said coating which results in a residual dipole charge remaining after deposit of said coating, and said means for altering said residual charge includes means for applying an electrostatic field between said electrode and said coating to reduce said residual charge.
Claim 5
Dependent Claim
67 words
The invention of claim 2 wherein said coating is a conductive coating, said depositing means includes an applicator arrangement having at least a conductive portion thereof which defines the polarity and charge of said coating as it is deposited on said web, and said means for applying an electric field includes means for coupling an electric field between said electrode and said conductive portion of said applicator.
Claim 6
Dependent Claim
63 words
The invention of claim 4 wherein said depositing means includes electrostatic dipole charging of said web prior to or during deposit of said coating which results in a residual dipole charge remaining after deposit of said coating, and said means for altering said residual charge includes means for applying an electrostatic field between said electrode and said coating to reduce said residual charge.
Claim 7
Dependent Claim
92 words
Apparatus for improving the uniformity of a wet coating deposited by an applicator arrangement on one surface of a moving web of charge-retaining material which retains residual charges following deposition, said apparatus comprising an electrode mounted in adjoining relation to the opposite side of said web downstream of the applicator arrangement at a point wherein said coating still remains wet, and means for applying a potential to said electrode to reduce the residual charge of said web and thereby enhance redistribution of the still wet coating so as to improve its uniformity.
Claim 8
Dependent Claim
92 words
Apparatus for improving the uniformity of a wet coating deposited by an applicator arrangement on one surface of a moving web of charge-retaining material which retains residual charges following deposition, said apparatus comprising an electrode mounted in adjoining relation to the opposite side of said web downstream of the applicator arrangement at a point wherein said coating still remains wet, and means for applying a potential to said electrode to reduce the residual charge of said web and thereby enhance redistribution of the still wet coating so as to improve its uniformity.
Claim 9
Dependent Claim
69 words
The invention of claim 6 wherein coating is deposited by means of dipole charging of said web which results in a residual dipole charge of said web following such deposition, said coating is a conductive coating, and said means for applying a potential to said electrode includes means for applying a potential between said electrode and said conductive coating to produce an electrostatic field therebetween at the downstream point.
Claim 10
Dependent Claim
52 words
The invention of claim 6 wherein said applicator arrangement includes a conductive portion determining the polarity and charge of said coating as it is deposited on said web and said means for applying a potential includes means for applying a potential between said electrode and said conductive portion of said applicator arrangement.
Claim 11
Dependent Claim
21 words
The invention of claim 8 wherein said potential of said electrode is more positive than the potential of said applied coating.
Claim 12
Dependent Claim
21 words
The invention of claim 8 wherein said potential of said electrode is more negative than the potential of said applied coating.
Claim 13
Dependent Claim
13 words
The invention of claim 8 wherein said electrode comprises a conductive bristle brush.
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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) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |