Proportional air valve and method of providing proportional air flow
CA 1249200 A · Owner: Ross Operating Valve Company · Inventors: Mathis, Logan H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A proportional air control valve including a flow control element and a pair of springs, one of which is relatively light in weight and which normally holds the flow control element in its closed position and the other of which has a substantially higher rate and which is effective to preclude to resist further movement of the flow control element in its opening direction. The valve is operated by applying a pulsing actuating force to the flow control element.
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 24, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 24, 2006.
- 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.