Speaker membrane and process for making same
CA 1210338 A · Owner: Visaton Peter Schukat · Inventors: Bolz, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The speaker membrane comprises two layers of paper bonded to an intermediate layer of a synthetic plastic material. The plastic material has a plurality of small discontinuities and has an elastic modulus of more than 25,000 daN/cm2. The thickness of the intermediate layer is approximately one to three times the thickness of one of the paper layers. The membrane is particularly light and inherently rigid.
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
- Granted August 26, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 2003.
- 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.