# US 6,280,849 B1 · Glass article having surface coating of boric acid and method for producing the same

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- Number: US 6,280,849 B1
- Document ID: US6280849B1
- Status: Granted
- Kind: B1
- Application number: 09/254,233
- Filed: 1999-03-02
- Granted: 2001-08-28
- Earliest claimed: 1997-07-16
- Assignees: Nippon Electric Glass Co., Ltd.
- Inventors: Yoshiharu Miwa
- Web page: https://patentgrep.com/patent/US6280849B1

## CPC

- H01J 9/20: Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
- C03C 17/22: with other inorganic material (C03C17/34, C03C17/44 take precedence)
- C03C 17/25: by deposition from the liquid phase
- H01J 9/24: Manufacture or joining of vessels, leading-in conductors or bases
- H01J 9/38: Exhausting, degassing, filling, or cleaning vessels
- C03C 2217/228: Other specific oxides
- C03C 2218/11: from solutions or suspensions
- C03C 2218/355: Temporary coating
- H01J 2209/012: Coating
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

Boric acid is used as a surface-protection coating for protecting a desired surface area of a glass article from weathering, contamination by dirt, dust, moisture and others, and streaks and/or cracks due to collision and friction with other objects. The boric acid coating is readily washed out by water upon actual use of the glass article.

## Claims

### Claim 1

A glass article having a temporal surface-protection coating, said surface-protection coating being removed in use of the glass article, which is characterized in that said surface-protection coating is of water-soluble boric acid, said boric acid surface-protection coating being capable of being washed out from said glass article by water.

### Claim 2 (depends on 1)

A glass article as claimed in claim 1, wherein said surface-protection coating is a thin layer of 0.001-1000 μm in thickness.

### Claim 3 (depends on 1)

A glass article as claimed in claim 1, wherein said glass article is a glass funnel part for a cathode ray tube, said glass funnel part having an inner surface coated with said surface-protection coating of boric acid.

### Claim 4 (depends on 1)

A glass article as claimed in claim 1, wherein said glass article is a glass panel part for a cathode ray tube, said glass panel part having an inner surface coated with said surface-protection coating of boric acid.

### Claim 5

A method for producing a glass article having a temporal surface-protection coating on a glass surface thereof, characterized by steps of:
preparing the glass article having a glass surface while preparing a boric acid water solution;
applying said boric acid water solution onto said glass article to form a thin layer of said boric acid water solution on said glass surface; and
drying said thin layer of said boric acid water solution to form a water-soluble surface-protection coating of the boric acid on said glass surface.

### Claim 6 (depends on 5)

A method as claimed in claim 5, wherein said boric acid water solution is a water solution of orthoboric acid (H3BO3).

### Claim 7 (depends on 6)

A method as claimed in claim 6, wherein said water solution of orthoboric acid consists of 0.01-3 wt % orthoboric acid and the balance of water.

### Claim 8 (depends on 5)

A method as claimed in claim 5, wherein said surface-protection coating of said boric acid is 0.001-1000 μm in thickness.

### Claim 9 (depends on 5)

A method as claimed in claim 5, wherein said boric acid water solution is applied onto said glass article by brushing.

### Claim 10 (depends on 5)

A method as claimed in claim 5, wherein said boric acid water solution is applied onto said glass article by spraying.

### Claim 11 (depends on 5)

A method as claimed in claim 5, wherein said boric acid water solution is applied onto said glass article by immersing said glass article in said boric acid water solution.