Valve actuator
CA 1104468 A · Owner: Rockwell International Corporation · Inventors: Schoeneweis, E. Frederick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A1-, Abstract of the Disclosure, A valve actuator includes a hydraulic cylinder with a pair of pistons separately, slidably mounted therein for movement between a first end and a second end of the cylinder. An actuator rod is joined to a first of the pistons to extend through an opening in the first end of the cylinder to terminate exterior thereto and be capable of being joined to a valve stem. A high pressure gas accumulator is mounted on the cylinder to locate the second end thereof within the accumulator. The second end of the cylinder has an end closure with access therethrough to allow communication between the interior of the accumulator and a first side of the second piston of the …
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 July 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 1998.
- 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.