Switching mechanisms
CA 1097185 A · Owner: Secretary Of State For Industry In Her Britannic Majesty'S Government Of The United Kingdom Of Great Britain And Northern Ireland (The) · Inventors: Hay, Andrew G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a hydraulically driven reciprocatory tool comprising a piston with a shoulder reciprocable within a cylinder the, space within the cylinder on one side of the shoulder being maintained at high pressure, and the space on the other side of the shoulder being maintained at low pressure. The piston is driven against a constant bias force by means of pressure fluid by means of which a driving force is cyclically applied to the piston under the control of a shuttle valve. The shuttle valve position is controlled by the axial position of the piston in the cylinder as sensed via the pressure of fluid in a signal line connecting the shuttle valve with first and second ports in …
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 March 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 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.