Method of incorporating additives in polymeric materials
CA 1136844 A · Owner: Sandoz Ltd. · Inventors: Swasey, Chester C.; Blumberg, Morris
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, The incorporation of an additive into a thermoplastic polymer by melt blending can be controlled by incorporating the additive in the form of a cohesive blend with an indicator substance such as an optical brightener and checking the distribution of the indicator in the final product, e.g. by fluorescence measurements. The presence of a certain quantity of the indicator in a sample ensures the presence of a quantity of additive corresponding to the ratio of additive to indicator in the cohesive blend. 3700/PG/FZ/KC
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 December 7, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 7, 1999.
- 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.