Dynamic loudspeaker with plastic basket encapsulating front pole plate
CA 1104706 A · Owner: Bose Corporation · Inventors: Keezer, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A loudspeaker assembly and a method of making same, wherein the assembly comprises front and rear pole plates of low reluctance magnetic material. A plastic basket is formed with the front pole plate and encapsulated by the plastic material with the rear pole plate free of encapsulation by the plastic. The assembly is formed by placing the front pole plate in the rear of a mold for the loudspeaker basket and flowing plastic material into the mold to encapsulate only the front pole plate while leaving the rear pole plate free of being encapsulated by the plastic material.
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 July 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 1998.
- 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.