Method and apparatus for use in the manufacture of optical cable slottedrods
CA 2201050 A1 · Owner: Clarke, Mary Ann · Inventors: Clarke, Mary Ann; Eoll, Christopher K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for extruding a plastic rod having helical slots in its external surface comprises the use of a die including a relieved exit end face resulting in a more uniform drag on the plastic melt. Plastic rods so formed are used in slotted core type optical fiber telecommunication cables. The die includes internal channels which form peripheral ribs on the plastic rod. The channels may follow either a helical or a straight path.
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, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2019.
- 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.