Light diffuser for the photodynamic therapy of tumours in the oesophagus of a patient
CA 2033695 C · Owner: Ciba-Geigy Ag · Inventors: Monnier, Philippe; Wagnieres, Georges; Van Den Bergh, Hubert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light diffuser for simultaneous photodynamic therapy and hyperthermic treatment in the, oesophagus has an arrangement (14 to 18) which disperses radially the light (10) fed in by, way of an optical fibre (6) and has a tube (12) filled with silicone to which are added, concentrations, modulated in the axial direction of quartz grains having a , diameter of approximately 40 µm which bring about a refraction having little dependence on the, wavelength.
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 January 7, 1991 and granted November 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 2013.
- 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.