# US 5,352,535 A · Message board

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- Number: US 5,352,535 A
- Document ID: US5352535A
- Status: Granted
- Kind: A
- Application number: 08/008,480
- Filed: 1993-01-25
- Granted: 1994-10-04
- Earliest claimed: 1993-01-25
- Inventors: Ching-Fang Su
- Web page: https://patentgrep.com/patent/US5352535A

## CPC

- B32B 27/10: of paper or cardboard
- B32B 27/08: of synthetic resin
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- G09F 7/00: Signs, name or number plates, letters, numerals, or symbols (vehicle registration number plates B60R13/10); Panels or boards (show-cards G09F1/00; indicating arrangements for variable information G09F9/00, G09F11/00; illuminated signs G09F13/00; boards for notices or posters G09F15/00)
- B32B 2323/04: Polyethylene
- B32B 2327/06: PVC, i.e. polyvinylchloride
- B32B 2590/00: Signboards, advertising panels, road signs
- Y10T 428/31895: Paper or wood
- Y10T 428/31913: Monoolefin polymer
- Y10T 428/3192: Next to vinyl or vinylidene chloride polymer
- Y10T 428/31928: Ester, halide or nitrile of addition polymer
- Y10T 428/31935: Ester, halide or nitrile of addition polymer
- Y10T 428/31993: Of paper
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A message board has a surface layer made of a protectively mounted paper or plastic sheet which has a smooth plane adapted to be erasably written thereon with a whiteboard marker. An intermediate mounting layer is overlapped with and connected to the surface layer, and is made of a hard polyvinyl chloride or polyethylene. A base layer is overlapped with and connected to the intermediate mounting layer, and is made of a soft polyvinyl chloride to be attached directly to and removed from a glazy surface repeatedly.

## Claims

### Claim 1

A three-layer message board comprising:
a smooth planar surface layer of a material which can be erasably written on with a whiteboard marker;
an intermediate mounting layer of hard polyvinyl chloride or polyethylene connected to said surface layer; and
a base layer connected to said intermediate mounting layer, said base layer being of a soft polyvinyl chloride whereby said base layer can be attached directly to and removed from a glazy surface repeatedly.

### Claim 2 (depends on 1)

A message board as claimed in claim 1, wherein said surface layer is a paper sheet.

### Claim 3 (depends on 1)

A message board as claimed in claim 1, wherein said surface layer is a plastic sheet.

### Claim 4 (depends on 1)

A message board as claimed in claim 1, wherein said intermediate mounting layer is made of a hard polyvinyl chloride having a hardness in a range from about 5 to 15 PHR.

### Claim 5 (depends on 1)

A message board as claimed in claim 1, wherein said base layer is made of soft polyvinyl chloride having a hardness in a range from about 55 to 65 PHR.