Threading apparatus for a lower looper of an overlock sewing machine
CA 2063932 A1 · Owner: Wang, Shui-Nu · Inventors: Wang, Shui-Nu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A threading device for threading a lower looper of an overlock sewing machine having an orifice and a slot formed in an arm of the lower looper a hook, formed on a rear end of the arm and obliqued from the arm, a holder formed on one end of a lever a thread, threaded through the orifice of the arm can be carried by the holder toward the rear end of the arm the, thread slipping over the hook and located behind the hook when the holder moves beyond the hook and the, thread hooked by the hook and received in the slot when the lever is released.
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 March 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2014.
- 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.