Method and reagent kit for determining paper degradation in transformers
CA 2196254 C · Owner: Ashby, Gordon R. · Inventors: Dominelli, Nicola; Bird, Frederick John; Ashby, Gordon R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to power transformers. More particularly this invention pertains to a method and apparatus for detecting the degree of degradation of paper insulation in a transformer by determining the concentration of furaldehyde in the transformer oil. A reagent for detecting the presence of furaldehyde in transformer oil comprising: (a) a primary amine selected from the group consisting of aniline, toluidine, anisidine and aminophenol or an amine; (b) a second component comprising approximately 15 to 33 (weight to volume) percent of acetic acid alone, or in combination with citric acid; from approximately 67 to 85 (volume) percent of a halogenated hydrocarbon selected from the …
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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
- Filed January 29, 1997 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 2019.
- 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.