# US 10,485,108 B1 · Method of conformal coating

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- Number: US 10,485,108 B1
- Document ID: US10485108B1
- Status: Granted
- Kind: B1
- Application number: 15/471,909
- Filed: 2017-03-28
- Granted: 2019-11-19
- Earliest claimed: 2017-03-28
- Assignees: Northrop Grumman Systems Corporation
- Applicants: Jerry T. Fang
- Inventors: Jerry T. Fang
- Web page: https://patentgrep.com/patent/US10485108B1

## CPC

- H05K 3/285: {Permanent coating compositions}
- B05B 9/03: characterised by means for supplying liquid or other fluent material {(B05B9/002 takes precedence)}
- B05B 12/00: Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05D 1/02: performed by spraying
- B05D 3/007: {After-treatment}
- H05K 1/0237: {High frequency adaptations (H05K1/0216 takes precedence)}
- H05K 3/0091: {Apparatus for coating printed circuits using liquid non-metallic coating compositions}
- B05D 5/083: {involving the use of fluoropolymers}
- B05D 2401/00: Form of the coating product, e.g. solution, water dispersion, powders or the like
- H05K 2203/0736: Methods for applying liquids, e.g. spraying
- H05K 2203/1366: Spraying coating
- H05K 2203/1377: Protective layers
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)

## Abstract

A method of, and system for, providing an amorphous fluorinated polymer conformal coating to an RF circuit board is described. A coating solution including the amorphous fluorinated polymer dissolved in a fluorinated solvent is provided. The coating solution is applied to the RF circuit board via a mechanically controlled fluid spray application device to produce a coated board. A predetermined time period is waited for substantial evaporation of the fluorinated solvent from the coated board, thus leaving behind a conformal coating of the amorphous fluorinated polymer on a board surface area.

## Claims

### Claim 1

A method of providing an amorphous fluorinated polymer conformal coating to at least one side of an RF circuit board, the method comprising:
providing a coating solution including the amorphous fluorinated polymer dissolved in a fluorinated solvent;
applying the coating solution to the RF circuit board via a mechanically controlled fluid spray application device to produce a coated board; and
waiting a predetermined time period to substantially evaporate the fluorinated solvent from the coated board, thus leaving behind a conformal coating of the amorphous fluorinated polymer on a board surface area.

### Claim 2 (depends on 1)

The method of claim 1, including applying the coating solution to the RF circuit board via a spray nozzle coating device to produce the coated board.

### Claim 3 (depends on 1)

The method of claim 1, wherein the RF circuit board has a board surface area of more than 13 square inches.

### Claim 4 (depends on 1)

The method of claim 1, wherein the RF circuit board has a board surface with a length dimension of less than 19 inches and a width dimension of less than 17 inches.

### Claim 5 (depends on 1)

The method of claim 1, wherein the conformal coating is in the range of 3-18 microns thick across the board surface area.

### Claim 6 (depends on 1)

The method of claim 1, wherein a thickness of the conformal coating varies by less than 15 microns across the board surface area.