Continuous tube emitter
CA 1230981 A · Owner: Rain Bird Sprinkler Mfg. Corp. · Inventors: Pitchford, Edward J.; Brown, Richard D.; Plotkin, Mathias
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A continuous tube emitter and method of manufacture. The emitter comprises an elongated flexible plastic tube with a plurality of pressure-responsive flow control units internally overlying small outlet openings in the tube to control the flow rate of irrigation water through the outlet openings. The flexible plastic tube is formed from an elongated thin-walled web preferably having a plurality of flow control patches on one side, wherein each patch has a valve face defined by at least one shallow drip emission groove leading into a shallow valve recess of wider cross section. Small outlet openings are cut through the web and the valve recesses. A longitudinal margin of the web is trimmed …
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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 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 5, 2005.
- 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.