Lightproof package of photosensitive strip material
CA 2124969 A1 · Owner: E. I. Du Pont De Nemours And Company · Inventors: Rasel, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lightproof package of photographic strip material which is wound around a core and forms a hollow-cylinder film roll, its outer circumferential surface enclosed by a cover sheet, its inner circumferential surface enclosed by the core, and its end faces enclosed by thin-walled end caps, so that the packaging does not essentially change the outer dimensions of the existing film roll. The photographic material is not inadvertently exposed when the film roll is partially unwound for use and placed into an operating device under daylight conditions. -21-
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 June 2, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2016.
- 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.