Photosensitive composition and products
CA 1190040 A · Owner: Evreka, Inc. · Inventors: Cerami, Anthony; Yamin, Michael A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photosensitive composition is disclosed which is capable of, offering a visual calibrated reaction to the presence of ultraviolet radiation. The composition comprises a complex of a leuco dye and animal-derived serum albumin. The preparation of this complex has been found to stabilize the leuco dyes, to avoid fading after the presentation of a color reaction upon exposure. Also, the leuco dye-serum albumin albumin complex is capable of exacting calibration so that, scientifically significant quantitative measurements of ultra violet light exposure can be made. Moreover the present com-, position eliminates the need for the addition to the leuco dye of various activator compounds, that are …
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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 July 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2002.
- 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.