Vacuum control valve
CA 1318555 C · Owner: Cornish, Rodney H. · Inventors: Weber, James H.; Cornish, Rodney H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vacuum control valve logically selects between a pair of variable vacuum sources to provide a vacuum to a vacuum use station such that the supplied vacuum is the greater of the two vacuums (the lesser of the pressures). The valve has a main body with a longitudinal passageway extending between first and second inlets connectable to the vacuum sources. An outlet connectable to the vacuum use station is located centrally of the passageway and communicates therewith. A pair of valve elements are located in the passageway and operate to open and close fluid communication between the outlet and the two inlets so that the inlet having the greater vacuum is open for communication while the inlet …
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 June 1, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 1, 2010.
- 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.