Sme actuator
CA 1300580 C · Owner: Johnson Service Company · Inventors: Abujudom, David N.; Miller, Dennis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An SME actuator is provided by a housing a plunger, axially reciprocal in the housing; a compression spring or Belleville washers biasing the plunger in one direction SME, (shape memory effect) disc washers around the plunger and thermally deformable to move the plunger in the opposite direction, and a concentric electrical resistance heater and/or fluid inlet and outlet ports for thermally actuating the SME disc washers to in turn move the plunger. Multiposition control is provided by a stack of a plurality of SME Belleville disc washers of differing transition temperatures. Alternatively the washers can all have the same transition temperature and operate proportionally with increasing or …
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 May 12, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 12, 2009.
- 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.