Intumescent materials
CA 1267569 C · Owner: Thwaites, Peter J. · Inventors: Thwaites, Peter J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides an improved casing material for locating, at door edges a brush-like material for preventing the passage of cold smoke and an intumescent material which expands to obstruct. A tubular body has a slot for the bristles which project outwardly from a brush-like base located inside the casing, and an internal housing for the brush base insolates the slot from an interior portion of the body. A second slot is provided opposite the first slot. The construction of the body is such that the slots can be opened locally so that the brush base can be fitted through the first slot and the intumescent material may be passed in strip, form, through the second slot.
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
- Granted April 10, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 10, 2007.
- 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.