Self sealing heat insulating shutter system
CA 1115131 A · Owner: Tekram Associates · Inventors: Brosenius, Karl H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The system includes a plurality of heat insulating shutter sections which are mounted for movement along a guide track in manner which permits the sections to be pivoted from a vertical position, wherein air seals between the sections are engaged, to a second, inclined position, wherein the seals are disengaged to permit movement of the sections between the open and closed positions.
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 December 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 29, 1998.
- 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.