Roof underlayment
CA 2587623 C · Owner: Johnson, Terry R. · Inventors: Johnson, Terry R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An underlayment sheet (10, 10~) is applied in overlapping courses to a roof deck (36) for establishing a weather-resistant membrane for use as a final exposed surface or below a roof covering (50). The underlayment sheet (10 10~) has a bottom surface (16, 16~) to which a pressure sensitive adhesive section (22, 22~) is applied generally continuously along its length. A nonadhesive section (24, 24~) also extends the length of the bottom surface (16 16') adjacent its upper long edge (18, 18~) for providing a contact surface with the roof deck (36) which is devoid of any adhesive material. The nonadhesive section (24, 24~) is attached to the roof deck (36) using tin tags (44, 44~) or …
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 November 8, 2005 and granted April 15, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 8, 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.