Improved spring-based gravimeters and accelerometers
CA 2427115 C · Owner: Mihajlovic, Djordje · Inventors: Mihajlovic, Djordje
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spiral spring-supported proof mass for use in an accelerometer includes a plate of material having suitably high elasticity low coefficient of thermal expansion, low magnetic susceptibility and high strength for a proof mass. The plate has multiple spiral cuts. The spiral cuts are symmetrically disposed on a first circle of one radius and each of the spiral cuts terminate on a second smaller circle concentric with the first circle.
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
- Filed April 28, 2003 and granted December 10, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 2025.
- 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.