Rubber tube manufacture with film laminate overwrap
CA 2076931 A1 · Owner: Du Pont Canada Inc. · Inventors: Koster, Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of tubular rubber articles is disclosed and comprises a) forming a tube of uncured rubber on a mandrel; b) wrapping the tubular rubber by winding with a film laminate comprising i) at least one layer of a heat stabilized, oriented nylon film having a thickness of from 13 to 50 µm and having a shrinkage of 2 to 10% in the machine direction laminated to ii) at least one heat stabilized film selected from an oriented nylon film having a thickness of from 13 to 50 µm and having a shrinkage of 2 to 10% in the machine direction, or a cast nylon film having a thickness of from 15 to 155 µm and having a shrinkage of 0.5 to 1.5% in the machine direction; and c) curing …
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 August 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 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.