Method and apparatus for winding flat coils of filamentary materials such as optical fibers
CA 2000671 C · Owner: Hsu, Hui-Pin · Inventors: Hsu, Hui-Pin; Hu, William C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A winding assembly has at least two flat coils wound from a single filament and arranged with the coil major side surfaces facing one another, the filament winding in adjacent coils being oppositely directed. Three spaced apart guide plates (26), (28), (30) are axially mounted on a shaft ( 46) defining first and second winding spaces (32), (34). A first winding arm (40) rotates about the shaft to build up a flat coil in the first winding space and second winding arm (42) rotates about the shaft in the opposite direction to lay down a further flat coil in the second winding space.
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 October 13, 1989 and granted October 1, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 13, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 2011.
- 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.