Improvement of shingle and mat tensile strength with urea formaldehyde resin modifier
CA 2564094 C · Owner: Peng, Qinyun · Inventors: Peng, Qinyun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite sheet, and a process of making the same including cured modified , urea formaldehyde reinforced by glass fibers. The modifier is an acrylonitrilebutadiene-styre copolymer. A roofing shingle formed by coating the composite , sheet with filled asphalt represents a major application of the composite sheet.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 2, 2005 and granted September 11, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.