Web-stretching process
CA 1062427 A · Owner: Bakelite Xylonite Limited · Inventors: Nicholas, Donald C.; Leese, Leonard; Smith, Gordon C.R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is disclosed for the production of a stretched web of plastics material wherein a web comprising a thermoplastics resin is stretched uniaxially or biaxially by passing it through an apparatus comprising two endless articulated chains positioned to run along opposite sides of the web to be stretched. A plurality of web-gripping devices are mounted at intervals along the length of each chain. These are primary and secondary guide means for each chain for guiding the chain along a closed path in such a way that the degree of folding of the links of the chain can be varied at different points along the path, so varying the distance between adjacent gripping devices. Primary and …
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
- Granted September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
- 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.