Disk spindle motor
CA 2124348 C · Owner: Hajec, Chester S. · Inventors: Hajec, Chester S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A disk spindle motor (200) having a permanent magnet central shaft (202). A pair of annular non-magnetic combination, thrust and journal bearings (204A 204B) having truncated-conical outer surfaces (204') are spaced apart on the shaft (202). The bearings coact with complementary surfaces (210 211) on the hub (209) of a motor rotor (208). Shaft end caps (206A 206B), connect the shaft to base means (218) and have radially extending shoulders (206") which define annular gaps (225' 225") with the, rotor and function as ferrofluidic seals.
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 January 22, 1993 and granted April 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2015.
- 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.