US4830922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable controlled thickness conformal coating
Assignee: Fluke Corp
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Filing: 1986-02-28
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Granted: 1989-05-16
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Expires: 2006-02-28
Abstract
Abstract Easily removable conformable coatings having a controlled thickness with a predetermined minimum value are obtained by the application of a composition comprising a mixture of a viscous carrier material and small particles of a second material by any known method. When both the carrier material and the particulate material mixed therewith are selected to have high dielectric constants, the mixture may be used to obtain coatings suitable for protection of circuit boards supporting high impedance electrical circuits. A mixture of a commercially available grease, e.g., Amoco RYKON (TM), with glass microspheres comprising up to 50% of the volume and preferably in the size range 3-5 mils, provides excellent dielectric conformal coatings for high impedance circuit boards. By contrast, by selecting both the viscous carrier material and the particulate matter mixed therein to have high conductivity, electrically conductive coatings for particularized users may likewise be obtained according to this invention.
Inventors
- 👤 Bryan L. Sparrowhawk
- 👤 John M. Redfield, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:58
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/284; H05K2201/00; H05K2201/07; H05K2201/0707; H05K2201/0715; H05K2201/09; H05K2201/09818; H05K2201/09872; H05K2203/00; H05K2203/05; H05K2203/0562; H05K2203/0591; H05K2203/07; H05K2203/0756; H05K2203/0769; H05K2203/0779; H05K2203/0783; H05K3/282; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
206 words
An electrical circuit board having a portion of its surface conformally coated with an easily removable coating of a desired thickness, comprising a dielectric board for mounting of an electrical circuit thereon, a predetermined pattern of electrically conductive material mounted on a first side of said board to serve as a portion of said electrical circuit, at least one electrical component supported by said board and in electrical contact with said conductive pattern to form said electrical circuit mounted on said board, and an easily removable, physically-stable, chemically-inert coating of a desired thickness formed of a composition comprising a through mixture of a viscous, adhesive, easily removable, physically-stable, chemically-inert carrier selected from the group consisting of dielectric hydrocarbon greases and a physically-stable, chemically-inert particulate material, wherein said carrier has a consistency effective to contain said material and to maintain the shape of said coating and said material has a particle size equal to a minimum desired coating thickness and is mixed in a volumetric proportion to said carrier effective to provide at least one layer of material covering at least a portion of said surface and to determine said coating thickness, said coating conformally coating a portion of said board to at least said minimum thickness.
Claim 2
Dependent Claim
206 words
An electrical circuit board having a portion of its surface conformally coated with an easily removable coating of a desired thickness, comprising a dielectric board for mounting of an electrical circuit thereon, a predetermined pattern of electrically conductive material mounted on a first side of said board to serve as a portion of said electrical circuit, at least one electrical component supported by said board and in electrical contact with said conductive pattern to form said electrical circuit mounted on said board, and an easily removable, physically-stable, chemically-inert coating of a desired thickness formed of a composition comprising a through mixture of a viscous, adhesive, easily removable, physically-stable, chemically-inert carrier selected from the group consisting of dielectric hydrocarbon greases and a physically-stable, chemically-inert particulate material, wherein said carrier has a consistency effective to contain said material and to maintain the shape of said coating and said material has a particle size equal to a minimum desired coating thickness and is mixed in a volumetric proportion to said carrier effective to provide at least one layer of material covering at least a portion of said surface and to determine said coating thickness, said coating conformally coating a portion of said board to at least said minimum thickness.
Claim 3
Dependent Claim
14 words
The circuit board of claim 1, wherein said particulate material is a dielectric material.
Claim 4
Dependent Claim
15 words
The circuit board of claim 1, wherein said particulate material is an electrically conductive material.
Claim 5
Dependent Claim
15 words
The circuit board of claim 3, wherein the electrically conducted particulate material is aluminum powder.
Claim 6
Dependent Claim
39 words
The circuit board of claim 1, wherein said carrier is soluble in a solvent so that upon application of said solvent under normal ambient conditions to said coating, said solvent renders said carrier and said particulate material easily removable.
Claim 7
Dependent Claim
13 words
The circuit board of claim 2, wherein said material comprises a glass material.
Claim 8
Dependent Claim
12 words
The circuit board of claim 6, wherein said glass material is microspheres.
Claim 9
Dependent Claim
11 words
The circuit board of claim 7, wherein said microspheres are hollow.
Claim 10
Dependent Claim
32 words
The circuit board of claim 1, wherein said mixture has the ability to securely adhere to an inclined surface even when said inclined surface is subjected to acceleration, shock or prolonged vibration.
Claim 11
Dependent Claim
21 words
The circuit board of claim 1, wherein said particulate matter comprises not more than half of the volume of said coating.
Claim 12
Dependent Claim
17 words
The circuit board of claim 1, wherein the particle size of said material is about 3-5 mils.
Claim 13
Dependent Claim
15 words
The circuit board of claim 1, wherein said particles are of a generally spherical shape.
Claim 14
Dependent Claim
14 words
The circuit board of claim 1, wherein said particles of a generally cubical shape.
Claim 15
Dependent Claim
20 words
The circuit board of claim 1, wherein said particles are selected to be of a color indicative of said size.
Claim 16
Dependent Claim
13 words
The circuit board of claim 1, wherein said particles comprise a fluorescent material.
Claim 17
Independent Claim
153 words
A method of coating an electrical circuit board with an, easily removable, conformal dielectric coating of a desired thickness, comprising thoroughly mixing a viscous, adhesive, easily removable, physically-stable, chemically-inert dielectric hydrocarbon grease carrier and a physically-stable, chemically-inert, dielectric particulate material, said carrier having a consistency effective to maintain its shape and to contain said material and said material having a particle size equal to a minimum desired coating thickness and being mixed in a volumetric proportion to said carrier effective to provide a consistent mixture comprising at least one layer of the material covering at least a portion of an electrical circuit board onto which it is coated and to determine said coating thickness, applying said consistent mixture onto the portion of said board to be covered to form a an, easily removable, physically-stable, chemically-inert, dielectric coating of a desired thickness which conforms to the surface of the covered portion of said board.
Claim 18
Independent Claim
153 words
A method of coating an electrical circuit board with an, easily removable, conformal dielectric coating of a desired thickness, comprising thoroughly mixing a viscous, adhesive, easily removable, physically-stable, chemically-inert dielectric hydrocarbon grease carrier and a physically-stable, chemically-inert, dielectric particulate material, said carrier having a consistency effective to maintain its shape and to contain said material and said material having a particle size equal to a minimum desired coating thickness and being mixed in a volumetric proportion to said carrier effective to provide a consistent mixture comprising at least one layer of the material covering at least a portion of an electrical circuit board onto which it is coated and to determine said coating thickness, applying said consistent mixture onto the portion of said board to be covered to form a an, easily removable, physically-stable, chemically-inert, dielectric coating of a desired thickness which conforms to the surface of the covered portion of said board.
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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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |