Irrigation drain valve
CA 1088843 A · Owner: Clements, Lloyd W. · Inventors: Clements, Lloyd W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve body has a large threaded inlet portion adapted to e screwed into an irrigation coupling and also has, a large inlet, a tapered valve seat leading from the inlet to a smaller outlet portion with a cupped end of the outlet portion to turbulate the water. A valve closure member has a tapered head and a stem slidable in the body, and a spring urges the head with an O-ring seal away from the valve seat. A flared cup on the stem limits movement of the valve closure member by the spring. The cupped end of the body has a tapered bore and a, washer fitting loosely on the stem permits sand to pass to the tapered bore. The cup has ribs to limit pivotal movement on the body.
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 November 4, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 4, 1997.
- 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.