Damper control device
CA 1204417 A · Owner: Bushell, George E. · Inventors: Bushell, George E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A damper control device for preventing freezing of fruit and vegetables in a cold storage area includes a cylinder with closed ends for mounting on the side of a cold air inlet duct, a piston slidably mounted in the cylinder the cylinder, on one side of the piston being filled with water a return, spring in the cylinder on the other side of the piston a piston, rod extending outwardly from such other side of the piston through the end of the cylinder, and a lever pivotally connected to the outer free end of the piston rod and extending into the duct for engaging a damper cover plate. The cover plate is biased to the open position by the lever for admitting cold air into the cold storage …
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 May 13, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 2003.
- 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.