Vibration damping compositions
CA 1296128 C · Owner: Iwata, Tadao · Inventors: Fujimoto, Jun; Yamauchi, Fumio; Yamamoto, Yohzoh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vibration damping compositions are provided which comprise an epoxy resin (I), obtained by addition reaction of a bisphenol type resin (a) with a cyclic ester (c) at the (c)/(a) weight ratio of from 20/80 to 98/2 and a curing agent, (II). The compositions are further characterized in that the (II)/(I) equivalent weight ratio of said epoxy resin (I) and said curing agent (II) is in the range of from 0.6 to 1.4. This epoxy resin (I) makes it possible to scrupulously lower the glass transition temperature of a cured product formed therefrom, i.e. a vibration damper, by changing the amount of the cyclic ester (c) used in preparation of said epoxy resin (I). The resulting vibration damper has …
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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 February 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 18, 2009.
- 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
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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.