Step open zone valve
CA 1136734 A · Owner: Honeywell Limited · Inventors: Waltham, Leslie M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control system for positioning the output shaft of a motor is disclosed having a motor for positioning the output shaft between first and second positions the output, shaft having an intermediate position between the first and second positions, a motor energizing circuit for energizing the motor to drive the output shaft from the first position towards the second position, a position responsive apparatus responsive to the intermediate position of the output shaft for stopping the output shaft at the intermediate position a time delay circuit responsive to the output shaft reaching the intermediate position for driving the motor after the passage of a predetermined amount of time to …
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 30, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 1999.
- 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.