# US 2014/0194022 A1 · Rooftop canvas

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- Number: US 2014/0194022 A1
- Document ID: US20140194022A1
- Status: Published application
- Kind: A1
- Application number: 13/737,100
- Filed: 2013-01-09
- Published: 2014-07-10
- Earliest claimed: 2013-01-09
- Inventors: YI-MIN CHEN
- Web page: https://patentgrep.com/patent/US20140194022A1

## CPC

- E04D 5/12: specially modified, e.g. perforated, with granulated surface, with attached pads
- B32B 3/28: characterised by a layer comprising a deformed thin sheet {, i.e. the layer having its entire thickness deformed out of the plane}, e.g. corrugated, crumpled (B32B29/08 takes precedence)
- B32B 5/024: {Woven fabric}
- B32B 27/08: of synthetic resin
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 2250/03: 3 layers
- B32B 2262/0253: Polyolefin fibres
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2274/00: Thermoplastic elastomer material
- B32B 2307/306: Resistant to heat
- B32B 2307/7265: Non-permeable
- B32B 2307/744: Non-slip, anti-slip
- B32B 2419/00: Buildings or parts thereof
- Y10T 442/3041: Woven fabric comprises strips or ribbons only
- E04D: ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F13/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Rooftop canvas includes a twill texture layer having a plurality of flat warp strips extending in a longitudinal direction and a plurality of flat weft strips extending in a lateral direction perpendicular to the longitudinal direction. An imaginary line passing through an intersection of one of the flat weft strips and one of the flat warp strips and an intersection of another flat weft strip adjacent to the flat weft strip and another flat warp strip adjacent to the flat warp strip is inclined relative to the longitudinal direction and the lateral direction. The twill texture layer is superimposed on a first covering layer. The rooftop canvas can further include a second covering layer, with the first covering layer sandwiched between the twill texture layer and the second covering layer.

## Claims

### Claim 1

Rooftop canvas comprising:
a twill texture layer including a plurality of flat warp strips extending in a longitudinal direction and a plurality of flat weft strips extending in a lateral direction perpendicular to the longitudinal direction, with an imaginary line passing through an intersection of one of the plurality of flat weft strips and one of the plurality of flat warp strips and an intersection of another of the plurality of flat weft strips adjacent to the one of the plurality of flat weft strips and another of the plurality of flat warp strips adjacent to the one of plurality of flat warp strips being inclined relative to the longitudinal direction and the lateral direction; and
a first covering layer, with the twill texture layer superimposed on the first covering layer.

### Claim 2 (depends on 1)

The rooftop canvas as claimed in claim 1, with each of the plurality of flat warp strips and the plurality of flat weft strips including at least one corrugated face, with the twill texture layer including at least one corrugated surface.

### Claim 3 (depends on 1)

The rooftop canvas as claimed in claim 1, further comprising: a second covering layer, with the first covering layer sandwiched between the twill texture layer and the second covering layer.

### Claim 4 (depends on 1)

The rooftop canvas as claimed in claim 1, wherein each of the plurality of flat warp strips and the plurality of flat weft strips is made of polyolefin.

### Claim 5 (depends on 1)

The rooftop canvas as claimed in claim 1, wherein the first covering layer is made of polyolefin.

### Claim 6 (depends on 3)

The rooftop canvas as claimed in claim 3, with the second covering layer is made of one of a thermoplastic elastomer, a polyolefin elastomer, or a polyolefin plastomer, or a mixture of polypropylene and at least one of a thermoplastic elastomer, a polyolefin elastomer, and a polyolefin plastomer.

### Claim 7 (depends on 4)

The rooftop canvas as claimed in claim 4, wherein the polyolefin is polypropylene.

### Claim 8 (depends on 5)

The rooftop canvas as claimed in claim 5, wherein the polyolefin is polypropylene.