Heating oil pump for selective one or two-line operation
CA 1278461 C · Owner: Danfoss A/S · Inventors: Knudsen, Hans J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heating oil pump is designed for selective one or two-line operation. Between the suction side (12) and return side (17) there is a connecting passage (23) which can be closed by a closure member (Z4) during two-line operation. The latter is displaceable from a closed to an open position during insertion of the plug by an actuating element projecting into the insertion path of the plug (27) and back to the closed position by a return spring during removal of the plug. This provides an automatic change-over without the need for the return pressure to be higher than the suction pressure.
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 January 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2008.
- 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.